Terrible means very bad, unpleasant, or of very poor quality. It can also describe something that causes great fear or shock.
From Old French *terrible* 'dreadful, causing terror', from Latin *terribilis* 'frightful', from *terrere* 'to frighten'. It once had a stronger sense of inspiring fear rather than just being low quality.
Calling a sandwich 'terrible' uses the same root as 'terrorist'—you’re literally saying it’s bad enough to inspire dread. Over time, the word slid from 'horrifying' to everyday 'really bad'.
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