難

difficult (to...) / problem / difficulty / difficult / not good

disaster / distress / to scold

clay / old variant of 僅|仅[jin3] / violet (plant)

short-tailed bird

extremely rare (idiom) / once in a blue moon

to be hard on sb; to deliberately make things difficult / Taiwan pr. [diao1 nan2]

to be hard on sb / to deliberately make things difficult

hard to explain in a few words (idiom); complicated and not easy to express succinctly

dilemma / quandary / to face a difficult choice

to raise a tough question

calamity

to tackle a difficult job (idiom) / to do sth reluctantly

to make do in difficult circumstances by being resourceful / (of circumstances) difficult / challenging / (of a budget) tight / (of a man-made thing) makeshift / rough and ready

hard to fathom a person's mind (idiom)

see 天下無難事，只怕有心人|天下无难事，只怕有心人[tian1 xia4 wu2 nan2 shi4 , zhi3 pa4 you3 xin1 ren2]

lit. An interval of time is worth an ounce of gold, money cannot buy you time. (idiom) / fig. Time is precious and must be treasured.

extremely difficult

lit. once said, a team of horses cannot unsay it (idiom); a promise must be kept

Destiny is inexorable, there is no fleeing it (idiom). Your doom is at hand.

lit. a single post cannot prop up a falling house (idiom) / fig. one is helpless alone

Easy to raise an army of one thousand, but hard to find a good general. (idiom)

can't be bought for one thousand in gold (idiom)

to be on the horns of a dilemma (idiom)

retort with challenging questions / debate