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brittle; fragile; weak; frail
tender-hearted; sentimental; easily moved
このガラスは脆いので注意が必要だ。
This glass is fragile, so caution is needed.
古い壁は予想以上に脆かった。
The old wall was more fragile than expected.
この合金は見た目ほど脆くない。
This alloy is not as brittle as it looks.