noun
a state of being excessively or overly anxious
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Her overanxiousness about the upcoming exam was evident in her constant studying and fretting.
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I can tell by your overanxiousness that you really care about how the presentation goes.
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Chill out, your overanxiousness is making everyone else stressed.
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His overanxiousness was like a heavy weight on his shoulders, causing him to second-guess every decision.