brainless
adj. B2 Upper Intermediate US //ˈbɹeɪnɫɪs// UK //bɹˈeɪnləs// brain·less
adj. describing someone who is very stupid or lacks common sense. It is a strong word that people use to show they think someone is acting like a fool.
adj. lacking intelligence or common sense; acting in a foolish or thoughtless manner. Often carries a derogatory or dismissive tone in informal contexts.
It was a brainless mistake to leave the keys in the car.
The politician made a brainless comment about the economy that immediately cost him his job.
While the plan seemed brilliant on paper, the brainless execution led to a total collapse of the project's budget and timeline.
From Middle English braynles; equivalent to brain + -less.