How to say "firsthand" in Japanese

Choosing the right word

じかにJLPT N3approx.Common
adverbFirsthand as an adverb: perceiving or getting something directly, in person, without going through anyone else. It describes how an action is done and is usually written in kana alone.
あなたとじかに会あってじっくり話はなしたいことがあるのです。↗
I have something to talk over with you, face to face.
直接ちょくせつJLPT N3approx.Common
na-adjective, no-adjective, adverbThe broader default for firsthand: information or experience gained directly, immediately, or in person rather than at second hand. It also covers the related senses 'direct' and 'immediate'.
彼女かのじょに直接ちょくせつ言いったらどうですか。↗
Why don't you tell her directly?

Both words express firsthand as 'directly, without an intermediary': pick 「じかに」 for the adverbial 'in person' nuance, and 直接 as the broader default, which also covers 'direct', 'immediate', and 'personal'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents

じかにdirectly
直接ちょくせつdirect
身をもってみをもってwith one's own body

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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