- unwearied
- undigested
- unrhymed
- unornamented
- uppermost
- uniformly
- unobservant
- unintended
- undemocratic
- underestimation
- undamaged
- unsoiled
- untainted
- untarnished
- unsociable
- unearned
- unstratified
- unchangeability
- unconverted
- unsex
- unnaturally
- unfailingly
- unenviable
- uncaused
- unperceptive
- unconsciously
- unknown to
- uptight
- unhoped
- undesirability
- undesirableness
- unpardonable
- unforgivable
- unedifying
- uncomely
- unexpectedness
- unsettle
- undesigned
- unmerchantable
- unquote
- unwisely
- uncurl
- unpromising
- unlearn
- untidily
- under no circumstances
- unknown quantity
- unspoilt
- unslaked lime
- underact