The Meaning of nibui [鈍い] In Japanese

鈍い
にぶい
Romaji: nibui N4

What does 鈍い mean?

Translation and Meaning

dull, blunt, slow to perceive, insensitive, dull ache

Definition

鈍い means dull or blunt, describing something not sharp or a person slow to perceive. It covers physical dullness as well as cognitive or perceptual sluggishness, and can describe dull pain or dull responses.

Type

adjective (形容詞・イ)

Stroke Order

Meanings

  • Physical dullness: a blade or edge that is not sharp.
  • Perceptual slowness: reduced senses or slow understanding; common collocations include 反応が鈍い and 頭が鈍い.
  • Dull pain or ache: a non-sharp, lingering sensation.
  • Muted brightness or sound: a color or noise that feels dull or unremarkable.

Composition

  • 鈍: the kanji conveys dullness or bluntness, often with a metallic or hard edge connotation; い is the adjective suffix forming the word as an i-adjective.

Usage

鈍い is an i-adjective used to describe dullness in objects or people’s perception, or slow to react; attaches to nouns directly (鈍い刃) and to predicates (edge が 鈍い, person が 鈍い). It is used in casual and neutral contexts; for people, prefer specific phrases like 頭が鈍い or 感覚が鈍い to avoid bluntness.
💡 Tips
Mnemonic: visualize a metal blade with a dull edge; the metal radical hints dullness and the suffix い marks an adjective, tying edge, senses, and reactions under one idea of lack of sharpness.

Variations

  • 遅い (おそい, osoi) — slow in time
  • 鈍感な (どんかんな, donkan na) — insensitive
  • のろい (noroi) — slow, sluggish
  • 鋭い (するどい, surudoi) — antonym meaning sharp

Example Phrases

  • 今日は鈍い頭で会議の話をちゃんと聞けなかった。
    Kyou wa nibui atama de kaigi no hanashi o chanto kikenakatta.
    Today I couldn’t listen properly to the meeting’s talk because of my dull head.
    Lista:
    • 今日は (kyou wa) – today
    • 鈍い頭で (nibui atama de) – with a dull head
    • 会議の話を (kaigi no hanashi o) – the meeting’s talk
    • ちゃんと (chanto) – properly
    • 聞けなかった (kikenakatta) – couldn’t listen
    In this sentence, 「鈍い」 means dull or slow to react, modifying 頭 to express mental sluggishness.
鈍い