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Uintaite
- a black asphalt-like material
Unfaulty
- not faulty, in perfect condition
Underrunning
- coming in to short (as in plane landing)
Unascertained
- Not yet discovered
- not made certain or known; unidentified
Unpaged
- (Of a book) lacking page numbers.
UNSTOPPED
- Verb
Past tense: unstopped; past participle: unstopped
Free (something) from obstruction.
Remove the stopper from (a bottle or other container).
Unconfident
- unsure; lacking in confidence