adverb
anyway; in any case; after all
Expresses resignation, inevitability, or scorn: the outcome is already decided or doesn't matter. Often carries a negative or dismissive tone.
どうせ私には無理だ。
It's no use for me anyway.
どうせやるなら、早く終わらせよう。
If we're doing it anyway, let's finish it quickly.
adverb
since it doesn't matter; you might as well
Used before a conditional or with ～だから to mean 'since the outcome is the same regardless'. Suggests a resigned or pragmatic decision.
どうせ行くなら、早いほうがいい。
If we're going anyway, the earlier the better.
どうせ暇だから、手伝うよ。
Since I'm free anyway, I'll help you.