adverb
Polite request marker, similar to どうぞ but softer and more indirect. Often used when asking for a favor or making a humble request.
See also: どうぞ
どうかお許しください。
Please forgive me.
I kindly ask for your favor.
adverb
somehow or other; one way or another
Expresses that something will be managed or resolved in some way, often with a sense of hope or determination. Less common than the request sense.
どうかなるでしょう。
It will work out somehow.
adverb
Used in the pattern かどうか to embed a yes/no question. This is a fixed grammatical construction, not a standalone adverb.
See also: かどうか
行くかどうかまだ決めていません。
I haven't decided whether to go or not.
adverb, noun or participle which takes 'suru'
Describes something being amiss or not right, often used with する to mean 'to be strange' or 'to be wrong'. Can also appear as どうかしている.
彼の様子がどうかしている。
There's something off about him.
この時計、どうかしてるよ。
This clock is acting strange.