1. 不瞻前顾后：rashly 无见识地 | rashness 不瞻前顾后 | rasmosin 升麻树脂

2. 轻率,鲁莽：rapturous 着迷的,狂喜的 | rashness 轻率,鲁莽 | ratiocination 推理,推论

noun

1. the trait of giving little thought to danger

Synonym: recklessnessfoolhardiness

2. the trait of acting rashly and without prudence

Synonym: heedlessnessmindlessness