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in an anxiously nervous manner
"we watched the stock market nervously"
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"our bodies jumped nervously away at the slightest touch"
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giggle
laugh nervously
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dither
act nervously; be undecided; be uncertain
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fevered
highly or nervously excited
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giggler
a person who laughs nervously
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titter
laugh nervously
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titterer
a person who laughs nervously