tenacious; hard to defeat

naughty

(derog.) old-fashioned and stubborn person; stick in the mud

urchin

mischievous; obstinate; to play; stupid; stubborn; naughty

stupidly obstinate

fierce and uncontrollable

ignorant and stubborn

stubborn and obstreperous; naughty and mischievous

gangster; bandit

obstinate; stubborn; pig-headed

unruly people; rebellious subjects; disloyal citizens

stubborn illness; chronic disease; (fig.) deep-seated problem; systemic issue

see 頑疾|顽疾[wan2 ji2]

blunt (instrument); stupid; thick-headed

very stubborn; very stubborn person; die-hard

(idiom) pigheaded

blunt thinking; apathy

(idiom) to put up fierce resistance despite being surrounded; to stubbornly refuse to admit defeat