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U
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unforeseen
Unexpected or not anticipated.
unforgettable
impossible to remove from your memory
unforgivable
So bad that it cannot be excused.
unforgiving
Harsh and relentless; not showing mercy.
unfortunate
Causing sadness or regret; unlucky.
unfortunately
Regrettably; sadly.
unfounded
Not based on facts or evidence.
unfriendly
Not kind or warm in behavior.
unfulfilled
not satisfied or completed
unfunded
Not provided with financial support.
unfunny
Not amusing or lacking humor.
ungodly
Extremely bad or shocking.
ungrateful
not showing gratitude or appreciation
unguarded
Not protected or monitored; open to attack.
unhappily
in a very sad manner
unhappiness
A feeling of deep sadness.
unhappy
feeling sad or dissatisfied
unharmed
Not injured or damaged.
UNHCR
United Nations agency for refugees.
unhealthy
bad for health or well-being
unheard
ignored or not listened to
unhelpful
Not providing assistance or support.
unhinge
to remove a door from its frame.
unholy
Not sacred or morally wrong.