incorrect
archaic
churlish
clownish
cryptic
ill-natured
illegible
inaccurate
inapplicable
incomprehensible
inconclusive
inelegant
obscene
priest-ridden
self-contradictory
slovenly
strange-sounding
un-english
uncouth
uneconomic
unexplainable
unmusical
unrefined
unsociable
untranslatable
grammatical