nerv
vigor, determination
Usage
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enervate
If something enervates you, it makes you very tired and weak—almost to the point of collapse.
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unnerve
If something unnerves you, it makes you upset or nervous; it can also make you lose your courage because it frightens you so much.
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nerve
get ready for something difficult or unpleasant
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nerveless
marked by calm self-control (especially in trying circumstances)
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nervous
unpredictably excitable (especially of horses)
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nervousness
the anxious feeling you have when you have the jitters
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nervy
being in a tense state
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unnerving
inspiring fear
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