確か (たしか, tashika) Japanese meaning: sure

確か (たしか, tashika) Japanese meaning: sure | Kotomora

Kanji

確かく実じつN3sense 1
確実 is objective and fact-based, often used for probabilities and outcomes, while 確か expresses the speaker's own subjective conviction.
正せい確かくN3sense 2
正確 emphasizes exactness and precision (e.g. of numbers or measurements), while 確か emphasizes general reliability or certainty.
明めい確かくN3sense 1
明確 stresses that something is clearly and unambiguously stated, whereas 確か simply conveys that the speaker feels sure of it.
定さだか
確か is common and used both affirmatively and negatively, while 定か is almost always used with negative forms like 定かでない.

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確かく
確か is the common everyday word for 'certain/sure', while 確 is a rare literary bound form used mainly in fixed phrases like 確たる.
間ま違ちがいない
確か suggests the speaker is fairly confident but allows some room for doubt, while 間違いない expresses near-total certainty.
紛まぎれもない
確か expresses personal certainty or reliability, whereas 紛れもない stresses that a fact is objectively undeniable.

不ふ確たしかN1sense 1
不確か means uncertain or unreliable, the direct opposite of 確か's sense of being sure or trustworthy.
疑うたがわしいN2
確か describes something certain or reliable, the opposite of 疑わしい's sense of doubt or unreliability.
怪あやしいN3
確か describes something certain or reliable, the opposite of 怪しい used to mean doubtful or uncertain.

確たしかにN3
確か is a na-adjective meaning 'certain' or 'reliable' (as in 確かな情報), while 確かに is its adverbial form meaning 'surely' or 'certainly'.

確たしかUsage66%
Standard kanji spelling; high-frequency word.
たしかUsage33%
Kana spelling is common in casual writing and when the adverbial sense is used.
慥たしかUsage<1%
rarely-used kanji form
Rarely used kanji form.
確たしかUsage<1%

Derived from the verb 確かめる (to confirm). The adverbial sense developed from the adjectival use.