THESAURUS
Forfeit
amercement, be bereaved of, bereavement, caution, caution money, charge, collateral, collateral security, cost, damage, damages, dead loss, debit, default, denial, denudation, deposit, deprivation, despoilment, destruction, detriment, dispossession, distraint, distress, divestment, drop, escheat, escheatment, expense, fee, fine, forfeiture, forgo, forgone, give over, give up, go astray from, incur loss, injury, kiss good-bye, let slip, lose, lose out, loser, losing, losing streak, loss, lost, margin, mislay, misplace, miss, mulct, penalty, perdition, privation, relinquish, relinquished, renounce, renounced, robbery, ruin, sacrifice, sconce, sequestration, spoliation, stake, stripping, suffer loss, surrender, surrendered, taking away, total loss, undergo privation, waive, waived, wander from, yielded
ROGET THESAURUS
Forfeit
Nonobservance
VB
fail, neglect, omit, elude, evade, give the go-by to, set aside, ignore, shut one's eyes to, close one's eyes to, infringe, transgress, violate, pirate, break, trample under foot, do violence to, drive a coach and six through, discard, protest, repudiate, fling to the winds, set at naught, nullify, declare null and void, cancel, retract, go back from, be off, forfeit, go from one's word, palter, stretch a point, strain a point.
Loss
VB
lose, incur a loss, experience a loss, meet with a loss, miss, mislay, let slip, allow to slip through the fingers, be without, forfeit, get rid of, waste, be lost, lapse.
Penalty
N
penalty, retribution, pain, pains and penalties, weregild, wergild, peine forte et dure, penance, the devil to pay, fine, mulct, amercement, forfeit, forfeiture, escheat, damages, deodand, sequestration, confiscation, premunire, doomage.
VB
fine, mulct, amerce, sconce, confiscate, sequestrate, sequester, escheat, estreat, forfeit.