Unfavorable; negative; not good. / Not suitable or fitting. / Not appropriate, of manners etc. / Unhealthy; liable to cause health problems.

(now colloquial) Badly.

Something that is bad; a harm or evil. / (slang, with possessive determiner) Error; mistake.

Used to scold a misbehaving child or pet.

(archaic) alternative past of bid. See bade.

(Britain, dialect, transitive) To shell (a walnut).

The quality or degree of being bad.

(litotes) Reasonably good.

simple past tense and past participle of bad

(transitive with with) (Canada, US, informal) in bad odour with someone, out of favour with someone, in someone's bad books