The Meaning of tashika [確か] In Japanese

確か
たしか
Romaji: tashika N4

What does 確か mean?

Translation and Meaning

certain, sure, reliable, indeed, certainly

Definition

確か means something is true or certain, and it also serves to hedge a statement when recalling information. It describes reliability or truthfulness in a given claim and can be used before nouns or as part of fixed phrases to express certainty or memory-based hedging.

Type

na-adjective (形容動詞) and adverb form as 確かに

Stroke Order

Meanings

  • certain, sure, reliable in reference to information or facts
  • adverbial form 確かに meaning certainly or indeed
  • hedging use indicating memory or approximation in casual speech
  • before nouns, 確かな modifies nouns to express a definite quality

Etymology

確 denotes certainty; か is the kun-reading that forms the adjective/adverbial usage, resulting in 確か as a na-adjective and its adverbial/hedging forms

Origin

Borrowed from the Chinese character 確, introduced into Japanese through the classical writing system; appears in classical Japanese texts and has evolved into contemporary usage as both a na-adjective and adverb

Composition

  • 確 = certainty, truth; か = kun-reading that forms the na-adjective; together they produce 確か with the core sense of certainty

Usage

Used as a na-adjective to describe nouns (確かな情報, 確かな証拠) and as an adverb in 確かに, to affirm or concede when recalling information; suitable for both casual and formal contexts, with nuances shifting toward memory-based hedging in everyday speech
💡 Tips
Mnemonic: imagine a checklist where every item is verified; each checkmark reinforces certainty, echoing the core meaning of 確か

Variations

  • 確かな (tashika na) — formal description of certainty
  • 確かに (tashika ni) — adverb meaning certainly or indeed
  • 確か (tashika) — stem used before other particles or in compounds
  • 不確か (futashika) — uncertain, doubtful (antonym)
  • 正確 (seikaku) — precise, accurate (related but more formal)

Example Phrases

  • 展覽会で 実物を 触って サイズを 確かめる。
    Tenrankai de jitsubutsu o sawatte saizu o tashikameru.
    At the exhibition, I touch the real object to check its size.
    Lista:
    • 展覧会で (tenrankai de) – at the exhibition
    • 実物を (jitsubutsu o) – the real object
    • 触って (sawatte) – touching
    • サイズを (saizu o) – size
    • 確かめる (tashikameru) – to check
    「実物」 means the real object; here it is the object being touched to compare its size.
  • 確か、彼は今夜も遅れるはずだ。
    tashika, kare wa kon’ya mo okureru hazu da.
    I’m sure he’ll be late again tonight.
    Lista:
    • 確か (tashika) – certainly
    • 彼 (kare) – he
    • は (wa) – topic marker
    • 今夜 (kon’ya) – tonight
    • も (mo) – also
    • 遅れる (okureru) – to be late
    • はずだ (hazuda) – should be
    Here 「確か」 functions as an adverb meaning ‘certainly’ or ‘if I recall correctly’, expressing the speaker’s belief about a likely outcome.
確か