What's the difference between imperceptible and unobtrusive?

Imperceptible


Definition:

  • (a.) Not perceptible; not to be apprehended or cognized by the souses; not discernible by the mind; not easily apprehended.

Example Sentences:

  • (1) That cameo seemed horribly emblematic of a thoroughly underwhelming opening half which ended unadorned by a single shot on target, but almost imperceptibly something was shifting, and Klopp’s demeanour slowly shifted from jovially laid-back to scratchy and irritable.
  • (2) That shift might be imperceptible on paper, but where Araki's earlier work affected a certain nihilistic cool, Kaboom is  warm and sympathetic towards its characters.
  • (3) In addition, cocaine's effects on food and water consumption and urine and fecal excretion, which were maximal by day 2, were imperceptible by day 5.
  • (4) The significance of two handwritten numbers scribbled almost imperceptibly on the back had been overlooked until now.
  • (5) The chronic persistent hepatitis, however, may develop through clinically imperceptible changes into a chronic aggressive hepatitis, and the inapparent acute hepatitis can even pass over directly into cirrhosis.
  • (6) The cancerolytic effect of active systemic immunotherapy, which has been shown experimentally able to eradicate a complete population of tumour cells provided they are not very numerous, has been confirmed in various forms of human leukemia and in a few solid tumours against which it was applied as treatment of the imperceptible residual disease which remains after chemotherapy or surgery.
  • (7) After a visit to the camp in 1966, Joan Didion described Sandperl as a man who looked as if he had, "all his life, followed some imperceptibly but fatally askew rainbow" and the institute as naive.
  • (8) Disadvantages of this technique are the external incision across the columella, which leaves an imperceptible scar of no clinical significance, and postoperative nasal tip edema, which resolves with time.
  • (9) Timing measures were obtained from subjects instructed to tap a Morse key in synchrony with a metronome which marked a timing pattern consisting of alternating blocks of intervals of imperceptibly different duration.
  • (10) He was 36 yards out but his hard, flat shot fizzed past a poorly positioned wall, seeming to swish slightly, almost imperceptibly right then left then right again, like the tailfin of a dolphin.
  • (11) Early radiologic signs of the hematoma consisted of obliteration of the aortic silhouette on the anteroposterior view and the left primary sulcus on the lateral film by a convex expanding homogenous density whose medial border blended imperceptibly with the mediastinal shadow.
  • (12) With little hope, he pressed on with his appeals and, almost imperceptibly at first, fortune's wheel began to turn.
  • (13) The remarkable sensitivity of the liver to small changes in glycemia implies that the normal coupling of the exercise-induced increase in Ra to glucose utilization may be signaled by small, nearly imperceptible changes in glucose.
  • (14) Berry mustered only five more points; and almost imperceptibly, Villanova seized control, soaring to a 10 point lead inside the last five minutes.
  • (15) It was established that all forms of ischaemic heart disease are accompanied by a significant potassium deficit imperceptible for blood and urine examinations of their electrolyte composition.
  • (16) Additionally, scattered cells showing a signet ring configuration were present, and in two cases, focal areas displaying chondromyxoid elements were also seen that appeared to merge imperceptibly with the surrounding spindle cell population.
  • (17) Pregnancy rates (highest among younger age and low parity groups) were influenced significantly and almost equally by age and parity but imperceptibly by ethnic origin.
  • (18) However, after incubation with hyaluronidase followed by staining with Lycramine brilliant blue JL, staining of megakaryocyte cytoplasm was either imperceptible or very pale blue.
  • (19) Another alternative way consists in the reinforcement of conditioning aiming both at the elimination of residual immunocompetent cells and at a more efficient action upon the imperceptible tumoral mass.
  • (20) An initially slow start vindicated their decision but, almost imperceptibly, the entertainment value rose.

Unobtrusive


Definition:

  • (a.) Not obtrusive; not presuming; modest.

Example Sentences:

  • (1) He recommends not a bland and stimulus-free environment, but one whose elements are unobtrusive and unambiguous.
  • (2) Key to her survival has been her ability to stay calm and project an air of unobtrusive competence.
  • (3) Given that in rural Haiti, as in much of the less developed world, few women deliver in clinic or hospital where such data could be systematically obtained, exploitation of the preceding birth method would require identification of a convenient and unobtrusive point of contact between questioner and mothers who have recently delivered.
  • (4) On the positive side, patients expressed satisfaction with the efficacy, rapid recovery and small unobtrusive scars produced by the procedure.
  • (5) Occasionally it has been unobtrusive – such as Nationwide's sponsorship of the cash machine in Dev's corner shop in Coronation Street – but elsewhere it's been jarring – such as ITV's deal with Samsung for The X-Factor , which led to scenes of contestants squealing with delight to receive goody bags of Samsung gadgets, and turned every phone call and video diary entry into a mini-plug for the brand.
  • (6) Its "promoted tweet" service, for example, didn't launch until 2010 (four years after the company's foundation), and the frequency of promoted tweets – and of other new services such as "promoted trends" – has been fairly unobtrusive up to now.
  • (7) A label for this heart rate either was or was not provided, and subjects' eating behavior was measured unobtrusively.
  • (8) However, no controlled study has previously been conducted to obtain systematic but unobtrusive data on the actual influences of alcohol upon real-world driving behavior in its natural environment.
  • (9) When I walk in, he is standing in the queue, on his own, casually dressed, looking as ordinary and unobtrusive as he can.
  • (10) Obtrusive and unobtrusive observations revealed the cough rate higher when the patient was aware of being observed than when he was unaware of being observed.
  • (11) Custom-made to blend in with the Victorian wooden benches, it looks like a tea-trolley and is almost as unobtrusive as the small grey cameras perched on the bookshelves.
  • (12) When one makes practical application of the unobtrusive approach, the most difficult problem is defining which interdisciplinary topics are currently being taught.
  • (13) The current study used an unobtrusive methodology to describe the social image associated with smokeless tobacco use and with cigarette smoking in three "types" of teenage models--an athlete, a cowboy, and an average teenager.
  • (14) This study reports on an unobtrusive study of changes in physician referral behavior after a need-oriented continuing medical education program.
  • (15) Using an unobtrusive eyedrop medication monitor, we measured compliance with topical pilocarpine treatment in a sample of 184 patients.
  • (16) Bragg, admittedly, was a particularly unobtrusive figure – his silence emanating from a emotionless Blackberry, as the singer songwriter is on tour in Scotland.
  • (17) Unobtrusive observations of smoking behavior at four hospital areas designated as no-smoking and two designated as smoking revealed almost total compliance to a revised and stringent smoking control policy.
  • (18) It is reliable and unobtrusive and is particularly resistant to occlusion of the sampling line by secrections.
  • (19) Therefore it is only reasonably good taste to be as unobtrusive as possible.
  • (20) To investigate this finding, a survey of reference activity was conducted using measurement techniques unobtrusive to the user.