heedlessly
Adverb
Meaning
without care or concern
Source: WordNetSynonyms
carelessly
anyhow
jauntily
wildly
casually
indifferently
headlong
negligently
rashly
impulsively
foolishly
irresponsibly
unwisely
nonchalantly
perfunctorily
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Antonyms
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carelessly raised the children's hopes without thinking of their possible disappointment