Foolishness
Foolishness was a quality characterized by having a lack of good sense and  and being in opposition to wisdom. Folly was an act of foolishness and a fool was an individual who acted foolish.

The Vulcan soldier Nirak's name meant fool in the Vulcan language. ()

In 2254, Vina called Christopher Pike a fool for thinking he could resist the Talosians. Later, after Vina said she got headaches whenever Pike talked strangely, he asked her, "These headaches, they'll be hereditary you know. Would you wish them on a child or a whole group of children?", to which she responded, "Foolish". ()

In 2265, Gary Mitchell called Lee Kelso a fool for having seen the damaged starboard impulse packs and not noticing their condition. Later, when speaking to James T. Kirk, Mitchell joked that, "Compassion and command are a fool's errand." ()

In 2266, when he was bluffing his way out of a precarious situation, James T. Kirk said to his counterpart on the Fesarius, "We grow annoyed at your foolishness." ()

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