Bad

Bad is an adjective: (1) Having undesirable or negative qualities: ‘I tried to ignore his bad behaviour.’ (2) Very intense: ‘I have a bad headache.’

Badly is an adverb: ‘The child behaves badly in school.’

The phrase bad things/s is generally over-used and often sounds unnatural.

Badly + past participle: ‘The car was badly damaged.’

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