费劲
to require effort; strenuous
费劲儿
erhua variant of 費勁|费劲[fei4 jin4]
费尽心思
to rack one's brains (idiom); to take great pains to think sth through
费尽心机
to rack one's brains for schemes (idiom); to beat one's brains out
浪费金钱
to squander money; to spend extravagantly