Socially unacceptable, as:
Constituting a faux pas.
(of word formation or usage) Morphologically or grammatically allowable but unidiomatic.
See also: accidental gap
A person who has not done one half his day's work by ten o clock, runs a chance of leaving the other half undone. Emily Brontë
The greatest weariness comes from work not done. Eric Hoffer
When a thing's done, it's done, and if it's not done right, do it differently next time. Arthur Ransome
Something done at the wrong time should be regarded as not done. Hindi Proverb
Who has not done any evil act, his or her heart may be found right. Egyptian Proverb
He has not done who is beginning. French Proverb