- uninominal system
- unremunerative work
- unwanted
- unwaged
- unprovocative
- unprovoked and boisterous laughter
- unrestrainedly
- unmoral
- unethical
- undeservedly
- unjustly
- unequally
- unscripted
- unreassuring
- unironed
- undemocratically
- undertow
- untaxed
- unicri
- up to no good
- up to now
- up to our necks
- under subjection or control
- unlisted
- unwounded
- unvendible
- unsubdued
- untempered
- unsuspecting
- unsurprisingly
- unpasteurized
- unintelligible chattering
- unwillingness
- untender
- united nations organisation
- unworthy of utterance
- unthreatening
- under sway
- under that
- underestimate
- undereducated
- underrate
- UNIX operating system
- UNIX system
- upper extremity
- unread
- uncrystallized
- unrecorded
- unwomanly
- unfeminine