remiss

adjective2

1. •
   At fault; failing to fulfill responsibility, duty, or obligations.

   • It would be remiss of me, in my duties, if I did not give credit where credit was due.
2. •
   Not energetic or exact in duty or business; careless; tardy; slack; hence, lacking earnestness or activity; languid; slow.

   • Thou never wast remiss, I bear thee witness: — 1671