Definition of shitless in US English:

shitless

adjective

in phrase be scared/bored shitless
vulgar slang
  • Be extremely frightened (or bored).

    frightened, afraid, fearful, nervous, panicky, agitated, alarmed, worried, intimidated
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Pronunciation

shitless

/ˈSHitlis//ˈʃɪtlɪs/