How to say "for some reason" in Russian?

Почему-то

"for some reason" is Почему-то in Russian.

Почему-то means "for some reason" in English.

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Word #1034 of 4,000 by frequency in Russian — level B1.

Example

Почему-то он не ответил на моё письмо.

For some reason, he didn't reply to my letter.