What's the difference between elusive and elusory?

Elusive

Definition:

(a.) Tending to elude; using arts or deception to escape; adroitly escaping or evading; eluding the grasp; fallacious.

Example Sentences:

(1) The successful treatment of the painful neuroma remains an elusive surgical goal.
(2) Diagnostic difficulties were encountered due to the rarity of such infections and elusive identification of the organism with routine laboratory procedures.
(3) Diagnosis with light microscopy can be elusive; electron microscopic and immunohistochemical evaluation are necessary to confirm the pathological condition.
(4) But an agreement looks elusive, and it appears that another election will be held soon.
(5) Effectiveness and safety of other molecules remain elusive.
(6) Thus, the identity of the suppressive factor(s) in cultured I-CB cell supernatants remains elusive.
(7) The quality of family life is as elusive a concept as is quality of life for the individual.
(8) In the United States, early diagnosis and cure of gastric carcinoma remain elusive.
(9) Despite their functional prominence, the structural requirements of fully functional GABAA-receptors are still elusive.
(10) The explanation for this dramatic loss of GSH has been investigated by many laboratories but the solution has been elusive.
(11) While the etiology and pathogenesis of such lesions remain elusive, physicians performing hair transplantations should be aware of this potential sequela.
(12) Les Cafeteras began the second half in similarly determined mode and the elusive Rincón sent a shot dipping fractionally over the bar from distance.
(13) Never before has so much been learned about the molecular biology of a virus in such a short time since its discovery and yet effective strategies for fighting the human immunodeficiency virus that causes AIDS remain elusive.
(14) With her first book, Girl Online, due out in November and an audience estimated to be 26 times that of the circulation of British Vogue, Zoella is a key example of what the advertising world call a “crowdsourced people’s champion” – one who earns hundreds of thousands of pounds a year and is paid by brands such as Unilever to connect with the ever-elusive 18-30 demographic.
(15) We retrospectively reviewed the MR examinations of five patients with surgically proved cervical epidural abscess in order to assist in the diagnosis of this clinically elusive disorder.
(16) Steroid hormone receptors are elusive, labile regulatory proteins which communicate the action of the sex hormones, estrogens and progestins, in target organs such as the breast and uterus.
(17) However, the principles of optimal mAb selection remain elusive, as their efficacy in vivo does not always correlate with their characteristics in vitro.
(18) Bacterial endocarditis is an elusive disease that challenges clinicians' diagnostic capabilities.
(19) The chronic inflammatory diseases in humans have been intensively investigated, however the immune mechanisms underlying diseases such as rheumatoid arthritis (RA), inflammatory bowel disease, and periodontal disease (PD) remain elusive.
(20) Three years later, the proud owner of a PG diploma in housing studies and member of the Chartered Institute of Housing, I was offered the opportunity to complete a further year's study and obtain that elusive degree.