確(たし)か

たしか

adverb

certainly, if I remember correctly

See also: 確(たし)かに (adverbial form)

1. certainly, surely

Expressing confidence that something is true or will happen.

I certainly heard it.

With に for emphasis

それは確(たし)かにそうです。

That is certainly true.

It's certainly difficult, but I think I can do it.

He certainly made a promise. There's no mistake about it.

The teacher's explanation was certainly easy to understand, but I'd like to hear it once more.

2. if I remember correctly

Used when recalling something but not being 100% certain. Often at the beginning of a sentence.

If I remember correctly, tomorrow is Sunday.

I think it was near the station.

I believe she came from Osaka.

If I remember correctly, I think I watched that movie last summer.

If I remember correctly, he was studying Japanese at university, but I don't remember well.

確(たし)か has two distinct usages depending on context.

USAGE (sense 1, 確(たし)かに):
With に, expresses strong certainty or acknowledgment.

USAGE (sense 2, 確(たし)か at the start):
Without に at sentence start, expresses vague memory.

COMMON COLLOCATIONS (adjectival):
確(たし)かな + noun = certain, reliable

Related Words

core

Added 2026.1.7 21:48 · Revised 2026.10.8 15:25

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