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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.
unsurprising
Not causing surprise; expected.
unsurprisingly
Not surprising; expected in outcome.
unsuspecting
not aware of potential danger or harm.
unsustainable
Not able to be maintained over time.
unsympathetic
Lacking compassion or understanding.
unt
Short form for university or organization.
untamed
Wild and not domesticated; free-spirited.
untapped
Not yet utilized or developed.
untenable
Not able to be maintained or defended.
untested
not tried out or proven.
unthinkable
Impossible to imagine or believe.
untidy
Messy or not organized.
untie
To loosen or release a knot.
until hell freezes over
Never; an impossible condition.