Source : Webster's Revised Unabridged Dictionary (1913)

Remiss \Re*miss"\, n.
   The act of being remiss; inefficiency; failure. [Obs.]
   ``Remisses of laws.'' --Puttenham.

Remiss \Re*miss"\ (r?-m?s"), a. [L. remissus, p. p. of remittere
   to send back, relax. See {Remit}.]
   Not energetic or exact in duty or business; not careful or
   prompt in fulfilling engagements; negligent; careless; tardy;
   behindhand; lagging; slack; hence, lacking earnestness or
   activity; languid; slow.

         Thou never wast remiss, I bear thee witness. --Milton.

         These nervous, bold; those languid and remiss.
                                                  --Roscommon.

         Its motion becomes more languid and remiss. --Woodward.

   Syn: Slack; dilatory; slothful; negligent; careless;
        neglectful; inattentive; heedles; thoughtless.

Source : WordNet®

remiss
     adj : failing in what duty requires; "derelict (or delinquent) in
           his duty"; "neglectful of his duties"; "remiss of you
           not to pay your bills" [syn: {derelict}, {delinquent},
           {neglectful}]