Antonyms of adj remiss

1 sense of remiss

Sense 1
derelict, delinquent, neglectful, remiss -- (failing in what duty requires; "derelict (or delinquent) in his duty"; "neglectful of his duties"; "remiss of you not to pay your bills")

INDIRECT (VIA negligent) -> diligent -- (characterized by care and perseverance in carrying out tasks; "a diligent detective investigates all clues"; "a diligent search of the files")

Similarity of adj remiss

1 sense of remiss

Sense 1
derelict, delinquent, neglectful, remiss -- (failing in what duty requires; "derelict (or delinquent) in his duty"; "neglectful of his duties"; "remiss of you not to pay your bills")
       => negligent (vs. diligent) -- (characterized by neglect and undue lack of concern; "negligent parents"; "negligent of detail"; "negligent in his correspondence")