/ rɪˈmɪs; NAmE / adjective
[ not before noun ] remiss (of sb) (to do sth) | remiss (in sth / in doing sth) ( formal ) not giving sth enough care and attention
SYN negligent :
It was remiss of them not to inform us of these changes sooner.
She had clearly been remiss in her duty.
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WORD ORIGIN
late Middle English : from Latin remissus slackened, past participle of remittere . The early senses were weakened in colour or consistency and (in describing sound) faint, soft .