witless

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Related to witlessness: lawlessness

scare someone witless

INFORMAL
If something or someone scares you witless, they make you very frightened or worried. I saw that film when I was in Paris and it scared me witless. You read about all these things that can cause cancer and it scares you witless.
See also: scare, witless

be scared/bored ˈwitless

(informal) be extremely frightened or bored: Despite his reputation as a tough guy, he admits that he was ‘scared witless’ when he first arrived in New York.
See also: bore, scare, witless