unsociable
unsolvable
unsophisticated
unsound
unspeakable
unspoiled
unsportsmanlike
unstable
unsteady
unstitch
unstrap
unsubmissive
unsubstantiated
unsuccessful
unsuccessfully
unsuitable
unsullied
unsure
unsurpassed
unsurprising
unsuspecting
unswerving
unsympathetic
untalented
untangle