The Meaning of osanai [幼い] In Japanese

幼い
おさない
Romaji: osanai N5

What does 幼い mean?

Translation and Meaning

young, childish, immature

Definition

幼い means young in age, typically describing a child who has not yet reached maturity; it also conveys innocence or naivety in a gentle, sometimes evaluative sense, depending on context.

Type

adjective (i-adjective)

Stroke Order

Meanings

  • Primary sense: the state of being in the early developmental stage, typically referring to children.
  • Nuance: implies innocence or naivety; tone may be affectionate or slightly condescending depending on context.
  • Usage extension: can describe behaviors or appearances that resemble youth or lack of experience.

Etymology

Phonetic evolution: the term combines the kanji 幼 with the adjective suffix い; over historical usage the reading and meaning settled into the modern sense of youth and childishness.

Composition

  • 幼: young, infant; the core meaning related to early life
  • い: adjective suffix that turns the concept into an i-adjective describing a state or quality

Usage

Used in neutral or descriptive narration, academic and literary prose, and everyday speech; appropriate when referring to a child or childlike behavior. In formal writing, it is common to pair with 子 or 児 to emphasize age, while in casual speech it can carry warmth or critique depending on tone; typical phrases include 幼い頃 and 幼い性格.
💡 Tips
Mnemonic: OSANAI sounds like ‘oh, naïve’ — a quick cue for the word’s sense of youth and childlike naivety.

Variations

  • 若い (wakai) — young
  • 子供っぽい (kodomoppoi) — childish
  • 未熟 (mijuku) — immature

Example Phrases

  • 幼い子が 公園で 走る のを 見ると、 母は 安心する。
    osanai ko ga kouen de hashiru no o miru to, haha wa anshin suru.
    Seeing a young child running in the park makes a mother feel relieved.
    Lista:
    • 幼い子が (osanai ko ga) – the young child
    • 公園で (kouen de) – in the park
    • 走る (hashiru) – runs
    • のを (no o) – the running (the act of)
    • 見ると、 (miru to,) – when seeing
    • 母は (haha wa) – the mother
    • 安心する。 (anshin suru.) – feels relieved.
    The word 「幼い」 is an i-adjective describing the noun that follows, forming the phrase 「幼い子」 meaning ‘young child’.
幼い