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U
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unsold
Not sold; remaining in inventory.
unsolicited
Not asked for; given without request.
unsolved
Not figured out or resolved.
unsophisticated
Lacking refinement or complexity.
unsound
not valid or reliable.
unspeakable
Too horrible to describe.
unspecified
Not clearly defined or stated.
unspoiled
Not damaged or changed; pure and untouched.
unspoken
Not expressed in words; implied or understood.
unstable
Not steady; likely to change suddenly.
unsteady
Not firm or stable; shaky.
unstoppable
impossible to stop or prevent.
unstructured
Not organized or arranged in a specific way.
unsubscribe
To remove oneself from a mailing list.
unsubstantiated
Not supported by evidence or proof.
unsuccessful
not achieving the desired outcome
unsuccessfully
Not achieving the desired result.
unsuitable
Not appropriate or fitting.
unsung
not celebrated or recognized for achievements
unsung hero
A person who does good but is unrecognized.
unsupervised
not monitored or watched over.
unsupported
Not backed or reinforced.
unsure
Not confident or certain.
unsurpassed
Better than anything else.