Common words that rhyme with negligent include unintelligent, diligent, intransigent, effulgent, fulgent, cogent, contingent, indulgent, moment, endearment, enjoyment, consent, assent, precedent and prevenient.
She is an intelligent problem solver.
She thanked her diligent helper.
He said it was urgent.
The accrual of bonuses was contingent on company performance.
The agent handled classified materials.
Her abstentious behavior set her apart from her indulgent peers.