- unit process
- unswayed
- undulatory
- undulating membrane
- uncountable
- unfermented palm juice (a refreshing and stimulating beverage)
- unmurmuring
- unmoving heart
- undermine
- undermining the honour
- unprincipled
- unoffending
- unharmful
- unhurt
- unhygienic
- uncorrupted
- unequal to
- unsalable
- unhurried
- uakari
- unido
- unequalled
- unequaled
- uniprocessing
- unpledged
- unshapely
- unworthy
- unworthy of faith
- unworthy (act)
- unworthy of being enjoyed or used
- unworthy of or unfit for publication
- u.k.
- uxorious
- ultracentrifuge
- ultradolichocranic
- ultralente
- ultraviolet erasing
- umbilectomy
- umbellatus
- umbilical cord haematoma
- umbilical fistula
- umbilical diphtheria
- umbilical granuloma
- united nations development programme
- united nations international childrens emergency fund
- united nations childrens fund
- ultimate unit
- unworried
- ungentlemanly
- unwished