DictionaryimbecilityExtreme foolishness
noun

imbecility

im-buh-SIL-uh-tee/ˌɪmbəˈsɪləti/

Extreme stupidity or foolishness.

Ignoring every warning shows the sheer imbecility of his plan.

A woman foolishly saws through the very tree branch supporting her, with the cut clearly between her seated position and the trunk.
Etymology

Latin imbecillitas referred to weakness, especially bodily weakness, but also weakness of mind. The mental sense leads to the modern meaning of extreme stupidity or foolish behavior; the word’s deeper origin is uncertain.

More examples

  • The report exposes the imbecility of cutting safety inspections.
  • She shakes her head at the imbecility of the rumor.
  • It is sheer imbecility to share your password with strangers.

Forms

imbecility

imbecile noun — An insulting term for a foolish person.

imbecilic adjective — Extremely foolish or lacking good judgment.

Similar words

stupidity
Stresses a lack of intelligence rather than absurd conduct.
foolishness
Can describe milder lapses in judgment or silly behavior.
idiocy
Similarly harsh, often emphasizing how absurd an action seems.