当然だ
tōzen danatural or obvious; to be expected; of course
当然のことながら、彼は成功した。
As expected, he succeeded.
当然の結果だ。
It's a natural outcome.
Used to state that something is obvious or to be expected. Often used in responses to confirm agreement.
to be natural; to be justified
彼が怒るのも当然だ。
It's natural that he's angry.
Used to explain why someone's reaction or situation is understandable.
💡Pro Tip
Response to agreement
When agreeing with someone's statement, 当然だ can be used to emphasize agreement naturally. Example: A: 「明日試験でしょ？」 B: 「当然だ！」
⚡Gold Rule
Position in sentence
As a na-adjective, 当然だ can appear at the end of a sentence (e.g., 「それは当然だ」) or modify a noun (e.g., 「当然の結果」).
📖Word Origin
From the noun 当然 (tōzen, 'naturalness, propriety') + copula だ. The noun itself comes from Chinese 必然 (Bìrán, 'inevitable') via Middle Chinese.
📝Usage Notes
Used in both statements and responses. Often appears in formal contexts but is common in everyday speech. Can be softened with 当然ながら (~nagara) or strengthened with 当然のことながら (~mono nara).