adverb
easily; quickly; without resistance
Used when something collapses, succumbs, or gives way more easily than expected, often with a sense of disappointment or fragility. Common with verbs like 崩れる, 負ける, or 消える.
彼の自信はもろくも崩れ去った。
His confidence crumbled easily.
その計画はもろくも失敗に終わった。
The plan ended in failure without resistance.