adjective

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Bad / Weak

untenable - An idea or position that cannot be defended against criticism

With new accusations surfacing every day, though Melissa claimed that she was totally innocent, her hold on her job was becoming increasingly untenable.

adjective

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Bad / Dishonest

unscrupulous - Behaving in a way that is dishonest or unfair in order to get what you want

Jack climbed to the top of the management tree, but his unscrupulous methods meant that he had more enemies than friends when he got there.

adjective

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Good / Successful

Url

upscale - Of superior quality or status, often used to describe products, services, or areas.

They opened an upscale restaurant in the heart of the city.

adjective

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Bad / Confused

vague - Not clear

Joe got into the car to drive to the nearest mountain, even though he had only a vague idea of how to get there.

adjective

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Bad / Aggressive

Url

unrelenting - Persistent or continuous, without stopping or diminishing in intensity

The unrelenting heat of the desert made travel nearly impossible.

noun

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Good / Happy

Url

utopia - A real or imaginary place or state of things where everything is perect.

Sometimes people who strive for utopia are so naïve that the society they create is very flawed and less than ideal.

adjective

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Bad / Dirty

Url

unkempt - Messy or untidy in appearance, especially referring to hair or clothing, giving a neglected impression.

His unkempt hair made it look like he had just rolled out of bed.

adjective

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Other / Other

unsung - Not appreciated or praised for some accomplishment

For every general that is praised for a military victory, there are many unsung soldiers who did the dirty work and without whom the victory would not have been possible.

adjective

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Bad / Nervous

Url

unnerving - Disturbing or upsetting in a way that makes someone feel anxious or afraid, sometimes leading to a loss of courage, confidence, or composure.

It was an unnerving experience walking alone in the empty and unused area under the highway.

verb

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Bad / Dangerous

Url

unleash - To release something powerful or intense, especially something that has been held back; to set free or allow something to happen without restriction.

The storm unleashed heavy rains and strong winds across the region.

adjective

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Bad / Hostile

Url

unforgiving - Not making an allowance for error or weakness in others; not willing to forgive others for things they might have done wrong.

Because they knew that Alaska in the winter is an unforgiving environment, they had to plan their expedition very carefully.

verb

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Good / Smart

validate - To prove that something is true

Henry David Thoreau felt self-confident about his ideas, and he didn't need anyone else to praise him, because he validated his own ideas.