③
困难的;艰难的(坚忍难为)
相关 形容词理据由『质地坚硬、不易改变』喻『需费力、不易做好』——物之硬同于事之难(a hard problem『难题』,c.1200『difficult to do』)。
例句
This is a hard question to answer.这是个很难回答的问题;由物之坚硬喻事之难为(相关·比喻)——坚硬的不易敲开,问题亦费解难答。Life was hard for them in the mountains.他们在山里生活很艰难;同此——艰苦难捱。
溯源路径本义 → 义项3