0 not suitable or good enough for a particular purpose or activity -- 不適合的,不恰當的
The building was declared unfit for human habitation. 這座大樓被宣佈不適合居住。
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
再长的路,一步步也能走完,再短的路,不迈开双脚也无法到达。