Remiss /(r?-m?s")/

Re·miss

Remiss

a.
  1. 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.
    These nervous, bold; those languid and remiss.
    — Roscommon.
    Its motion becomes more languid and remiss.

Remiss

n.
  1. The act of being remiss; inefficiency; failure. [Obs.]