The Collaborative International Dictionary of English v.0.48:
Remorse \Re*morse"\ (r?*m?rs"), n. [OE. remors, OF. remors,F.
remords, LL. remorsus, fr. L. remordere, remorsum, to bite
again or back, to torment; pref. re- re- + mordere to bite.
1. The anguish, like gnawing pain, excited by a sense of
guilt; compunction of conscience for a crime committed, or
for the sins of one's past life. "Nero will be tainted
with remorse." --Shak.
2. Sympathetic sorrow; pity; compassion.
Curse on the unpardoning prince, whom tears can draw
To no remorse. --Dryden.
But evermore it seem'd an easier thing
At once without remorse to strike her dead.
Syn: Compunction; regret; anguish; grief; compassion. See
Moby Thesaurus II by Grady Ward, 1.0:
37 Moby Thesaurus words for "remorse":
anxiety, apologies, attrition, ayenbite of inwit, bitterness,
compunction, contriteness, contrition, embarrassment, grief, guilt,
guilty conscience, humiliation, mortification, pangs of conscience,
penance, penitence, penitently, regret, regretfulness, regrets,
regretting, remorse of conscience, remorsefulness, repentance,
repining, rue, ruefulness, self-reproach, shame, shamefacedness,
shamefastness, shamefulness, sorriness, sorrow, wistfulness, woe