remiss

Lax in attending to duty; negligent. synonym: negligent.

Not energetic or diligent in performance; careless in performing duty or business; not complying with engagements at all, or not in due time; negligent; dilatory; slack.

Wanting earnestness or activity; slow; relaxed; languid.

Synonyms Neglectful, etc. (see negligent), careless, thoughtless, inattentive, slothful, backward, behindhand.

An act of negligence.

The act of being remiss; inefficiency; failure.

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.

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

failing in what duty requires