lackluster -
Lacking in vitality, force, or conviction; uninspired or uninspiring
Ben finally realized he was a lackluster speaker when his coworkers were falling asleep during his presentation.
verb
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wane -
To become weaker in strength or influence
After the automobile was invented, the era of the horse and buggy on the streets and roads began to wane
nounverb noun
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decay -
The result of being destroyed by natural causes or by not being cared for.
The dentist tried to remove the decay in the teeth that had been caused by so much eating of cake and cookies.
adjective
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brittle -
Hard but liable to break or shatter easily
Glass is usually brittle and can break apart despite its strong appearance.
nounverb verb
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slack -
Loosen (something, especially a rope)
The thin rope slackened whenever the acrobat walked on it.
adjective
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frail -
(of a person) weak and delicate
The strongest marriages last even when one spouse is in frail health.
verb
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languish -
(of a person or other living thing) lose or lack vitality; grow weak or feeble
The crops languished in the field after the severe drought.
adjective
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haggard -
Looking exhausted and unwell, especially from fatigue, worry, or suffering
Once a cute child actor, Macaulay Culkin has looked surprisingly haggard in recent years.
verb
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deplete -
To reduce something by a large amount so that there is not enough left, such as resources or money
By the end of the marathon run, Bill felt that his energy was totally depleted, and he could barely walk.
noun
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liability -
Something that is likely to cause a problem.
Joe was going to choose Fred as his running mate, but then he realized that Fred's drinking problem would just make him a liability, so he chose someone else.
noun
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wimp -
A weak and cowardly or unadventurous person
Randy wanted to impress girls at the beach, but being a skinny wimp prevented him from doing so.
adjective
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zonked -
Exhausted; tired out
After studying for twelve hours straight, Fred was zonked out.
