Excessive, unshaven hair is as wild-hair, figurative of crude, undisciplined behavior
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Hairy 1. The animal or “beastly” side of self. 2. Annoyances or difﬁculties that just do not seem to go away. 3. A particularly frightening event or situation (as in a “hairy situation” or a “close shave”). 4. Intrigue and manipulation.