What's the difference between impropriety and unchastity?

Impropriety

Definition:

(n.) The quality of being improper; unfitness or unsuitableness to character, time place, or circumstances; as, impropriety of behavior or manners.
(n.) That which is improper; an unsuitable or improper act, or an inaccurate use of language.

Example Sentences:

(1) Xu, the ABP chairman, disputed any claims of impropriety, and said his company went through a “robust and thorough” tender process.
(2) The palace initially stated that “any suggestion of impropriety with underage minors” by the duke was “categorically untrue”.
(3) It would be hugely problematic for Perry if any clear evidence were to emerge that he stopped the funding because he did not want a public integrity unit, especially one led by a Democrat, probing too closely into alleged improprieties .
(4) The key was in Winkler's message about the "appearance of impropriety".
(5) HP said it had uncovered "serious accounting improprieties, disclosure failures and outright misrepresentations" at Autonomy.
(6) Any suggestion of impropriety is malicious and defamatory and will be treated as such,” said a spokesman.
(7) He said the party regarded "any implication of impropriety as unacceptable".
(8) Lenders have come under intense scrutiny from the Competition Commission and the Financial Conduct Authority (FCA) since the OFT report was published in September amid reports of widespread impropriety in the sector.
(9) This is not the first time sumo has had to contend with match-fixing claims , but they have never been investigated amid denials of any impropriety by the sport's governing body.
(10) Earlier this month Buckingham Palace issued vehement denials that the duke had “any form of sexual contact or relationship with Virginia Roberts” and said that “any suggestion of impropriety with under-age minors is categorically untrue”.
(11) HP called on the US and British authorities to investigate what it called "serious accounting improprieties, disclosure failures and outright misrepresentations at Autonomy" before the acquisition.
(12) "The newspaper believed that what it published on March 30, 2008 was legitimate and lawful and, moreover, that publication was justified by the public interest in exposing Mr Mosley's serious impropriety."
(13) Asked whether she was concerned that the SNP might no longer be seen as separate from the historical sleaze associated with Westminster politics – given that these revelations follow continuing police investigations into alleged financial impropriety by two former SNP MPs, Michelle Thomson and Natalie McGarry – Sturgeon responded that none of the individuals in question had been “proven to do anything wrong”.
(14) In a statement accompanying the interim report, No 10 said: "It is clear, as Liam Fox himself said, that serious mistakes were made in allowing the distinction between professional responsibilities and personal loyalties to be blurred, and this has clearly raised concerns about impropriety and potential conflicts of interest."
(15) There has been no procedural impropriety.” The tough stance adopted by Downing Street on the future of the House of Lords contrasted with the chancellor’s emollient tone as he made clear he would address the concerns raised by peers.
(16) But you can reclassify one.” City authorities deny any impropriety.
(17) The difference this time is that the National Socialist Underground got some help from part of the state.” The head of the BfV, Heinz Fromm, resigned in 2012 while facing public pressure over the mishandling of the NSU investigation, but he never mentioned the reason for stepping down, nor has the BfV admitted any improprieties.
(18) An extensive argumentation demonstrating the systematic impropriety in the Spanish Language of translating the English term "leukoplakia as leukoplasia, is presented.
(19) Nick Clegg has ordered an urgent review into how the Liberal Democrats have investigated "allegations of sexual impropriety" in the past after claims against a leading party official emerged.
(20) I’m not going to give you a question, you are fake news.” Facebook Twitter Pinterest BuzzFeed branded ‘garbage’ by Trump, who then attacks CNN The president-elect was dismissive of the memo at the center of the storm, insisting that the “alleged sexual impropriety” outlined in it didn’t happen and could not have happened as he always warned those around him on foreign tours such as the Miss World competition in Russia to be wary of hidden cameras that would get them put on television.