薄弱|はくじゃくhakujaku[0]heiban (flat)

1. noun, na-adjectivefeebleness; weakness

• Synonym脆弱ぜいじゃくNeutralna-adjective for fragility (「脆弱な基盤」「脆弱性」), typically of structures and systems; 「薄弱」 is for weak willpower or insufficient grounds.
• Synonym軟弱なんじゃくNeutralna-adjective for weakness (「軟弱な態度」「軟弱地盤」), stressing lack of backbone or soft ground.
• RelatedもろいNeutrali-adjective for brittle, fragile (「涙もろい」「もろいガラス」); common in speech.
• Related弱いよわいNeutralThe most general i-adjective for weak (「体が弱い」「意志が弱い」).
• Related希薄きはくNeutralna-adjective for thin or dilute (「人間関係が希薄」), mostly of relationships and the air.
• Related薄いうすいNeutralThe most general native i-adjective for thin, faint (「根拠が薄い」).
• Related薄っぺらうすっぺらCasualColloquial and derogatory for shallow, flimsy (「薄っぺらな知識」).
• Related空疎くうそWrittenFormal, written word for hollow, empty (「空疎な議論」).
• Related不甲斐ないふがいないNeutrali-adjective for spineless, disappointing (「不甲斐ない結果」), tinged with self-reproach or disappointment.
• Related意気地のないいくじのないCasualColloquial expression for spineless, lacking guts (「意気地のない男」).
• RelatedちゃちCasualColloquial for cheap, shoddy workmanship (「ちゃちな作り」).
• Related心弱いこころよわいWrittenWritten-style word for faint of heart (「心弱い人」).
• Antonym強固きょうこNeutralAntonym: firm, solid (「強固な意志」); the opposite of 「意志薄弱」.
• Antonym強靭きょうじんNeutralAntonym: tough, tenacious (「強靭な精神」); the opposite of 「薄弱」.
• Antonym頑丈がんじょうNeutralAntonym: sturdy, solid (「頑丈な体」); the opposite of 「薄弱」.

Use 「薄弱」 for willpower, grounds or constitution that lack firmness, as in 「意志薄弱」「根拠が薄弱」. For fragile structures or systems say 「脆弱」, for weak attitudes or soft ground 「軟弱」, and for thin relationships 「希薄」; the opposite is 「強固」.

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

1. 体力たいりょくや意志いしが弱よわいこと。
2. 確たしかでないこと。