かすか・微か・幽かkasuka[1]atamadaka (head-high)

1. na-adjectivefaint; dim; weak; slight; vague; indistinct; hazy
   すぐそばでかすかな音おとがした。↗

   I heard a faint sound nearby.
2. na-adjectivepoor; wretched; meagre; meager; scanty

• SynonymほのかNeutralA na-adjective for something faint and subtle (「ほのかな香り」「ほのかな不安」), often with a soft, gentle feel.
• Synonym微弱びじゃくNeutralA na-adjective for faintness (「微弱な電波」); used mostly for signals and electric currents.
• Synonym淡いあわいNeutralAn i-adjective for pale, light (「淡い色」「淡い期待」); stresses low intensity or concentration.
• SynonymおぼろげNeutralA na-adjective for things blurred and indistinct (「おぼろげな記憶」); stresses vagueness, while 「微か」 stresses faintness—something barely perceptible.
• Related不鮮明ふせんめいNeutralA noun for lack of sharpness (「不鮮明な画像」); used mostly for images and printing.
• Related曖昧あいまいNeutralA na-adjective for vagueness (「曖昧な返事」「曖昧な境界」); focuses on attitudes or boundaries being unclear.
• RelatedあやふやCasualA colloquial na-adjective for something unreliable (「あやふやな記憶」); stresses uncertainty.
• RelatedファジーNeutralA loanword meaning fuzzy (「ファジーな判断」); common in technical contexts and casual speech.
• Related不確かふたしかNeutralA na-adjective for uncertainty (「不確かな情報」); stresses that reliability is in doubt.
• Related弱々しいよわよわしいNeutralAn i-adjective for weak and feeble (「弱々しい声」); stresses lack of strength.
• Related不明ふめいNeutralA noun for unclear or unknown (「原因不明」); used mostly for facts that remain unknown.
• Related不明瞭ふめいりょうNeutralA na-adjective for lack of clarity (「不明瞭な発音」); used mostly for sounds and explanations.
• Related曖昧模糊あいまいもこWrittenA four-character idiom for vagueness (「曖昧模糊とした表現」); leans toward written prose.
• Related不分明ふぶんめいWrittenA written-style word for indistinctness (「不分明な点」); rare—「不明瞭」 is the usual choice.
• Relatedか細いかぼそいNeutralAn i-adjective for thin and frail (「か細い声」); used mostly for voices and the body.
• RelatedおぼろNeutralA na-adjective and noun for haziness (「朧月夜」); carries a literary flavor.
• RelatedおぼつかないNeutralAn i-adjective for unreliable, unsteady (「足元がおぼつかない」).
• Related幽微ゆうびWrittenA written-style word for something faint and profound (「幽微な趣」); rare.
• AntonymはっきりNeutralMeans clearly (「はっきり見える」); the opposite of 「微か」.
• Antonym明らかあきらかNeutralMeans obvious, evident (「明らかな違い」); the opposite of 「微か」.

Use 「微か」 when a sound, light, or memory is so faint it is barely perceptible (「微かな音」「微かに覚えている」). For a faint, subtle feeling say 「ほのか」; for something blurred, 「おぼろげ」; for weak signals, 「微弱」. The opposite is 「はっきり」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 辛かろうじて存在そんざいが認みとめられるさま。
2. 弱々よわよわしいさま。