Naturally; proper; reasonable — describes something that is appropriate, deserved, or to be expected.
彼が怒るのは当然だ。
It's only natural that he's angry.
約束を守らないのは当然の評価を失う行為だ。
Breaking promises is an act that deservedly loses respect.
試験に落ちたのは努力不足だから、当然の結果だ。
Failing the exam was the natural consequence of not studying enough.
そう言われれば当然のことだと納得した。
When it was put that way, I accepted that it was only natural.
As an adverb: naturally; as a matter of course — used when something happens or is done as one would expect.
彼は当然のように断った。
He naturally refused.
あなたが来ないなら、当然会議は延期されるだろう。
If you don't come, the meeting will of course be postponed.
そんな注意を受ければ、当然反省するべきだ。
If you receive such a warning, you should naturally reflect on it.