bad
UK: bæd | US: bæd
adj. of poor quality or low standard
adj. harmful or undesirable
adj. morally wrong or evil
adj. (informal) good in a rebellious or impressive way (e.g., "bad guy" in pop culture)
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"Bad" traces back to Old English bæddel (hermaphrodite, effeminate man), a term of contempt, and later merged with bædan (to defile). By the 13th century, it evolved to broadly mean "inferior" or "wicked." Its negative connotations solidified in Middle English, while modern slang repurposed it positively (e.g., "That’s so bad!" meaning "impressive").
The milk smells bad; it must be spoiled.
Smoking is bad for your health.
Stealing is a bad decision.
He played the bad guy in the movie but stole the show.
(Slang) "Your new car looks bad!" (meaning stylish/cool).