反義詞inappropriate:
adj. 不適當的不相稱的
You need to apologize to her for such inappropriate behavior.
你要為這種不恰當的行為向她道歉。
inappropriately:
adv. 不適當地
If you use the machine inappropriately, it may cause the machine to break.
如果你不恰當地使用該機器,可能會導致機器壞掉。