noun
a person who is negligent or careless
adjective
negligent or careless in performing one's duty
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It would be remiss of me not to mention the important contributions of our team members.
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I would be remiss if I didn't thank you for always being there for me.
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I'd be totally remiss if I didn't give a shoutout to my ride-or-die squad.
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Neglecting to appreciate the beauty of nature would be a remiss on our part.