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Negligent, neglectful, careless, unmindful, inattentive, uncaring, insouciant, indifferent, casual, slapdash, lax, perfunctory, superficial, sluttish, untidy, slovenly, uncircumspect
(adjective)
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Note that, according to Partridge, 'off-handed is unnecessary for off-hand; off-handedly is unnecessary for off-hand. These terms may be written as one word.'
(adjective)
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