bad; poor; undesirable

poor (quality); inferior; insufficient

evil; sinful

ugly; not beautiful

at fault; to blame; in the wrong

bad (at doing something)

unprofitable; unbeneficial

Interjection

sorry; (my) bad; unforgivable

evil; wickedness

(role of) the villain (in theatre, etc.); the bad guy

Common noun; Noun or participle which takes the aux. verb suru; Transitive verb; Intransitive verb

mischief; prank; trick; practical joke

Adjectival nouns or quasi-adjectives (keiyodoshi)

mischievous; naughty

Humble; Common noun; Noun or participle which takes the aux. verb suru; Transitive verb

pastime; hobby

Common noun; Noun or participle which takes the aux. verb suru; Transitive verb

playing with (e.g. a lighter); fooling around with; messing around with; amusing oneself with; tampering with

Euphemistic; Common noun; Noun or participle which takes the aux. verb suru; Intransitive verb

lewd behaviour; sexual misconduct; sexual assault; molestation; rape

(verbal) abuse; speaking ill of people; bad-mouthing; name-calling; slander; abusive language; insulting remarks