Synonyms of ill-behaved

1 Syllable

sly, bad, rude, ill, arch

2 Syllables

sinful, harmful, evil, tricky, nocuous, puckish, impish, teasing, vexing, vicious, playful, foxy, wayward, risky, rascal, artful, naughty, dickens, hurtful

3 Syllables

pernicious, hazardous, injurious, sportive, mischievous, malicious, damaging, irksome, rascally, spiteful, insidious, dangerous, vexatious, precarious, perilous, malignant

4 Syllables

frolicsome, ill-mannered, detrimental, bothersome, deleterious, misbehaving, troublesome, destructive

5 Syllables

exasperating