THESAURUS
relent
accede, accept, acquiesce, assent, be agreeable, be conservative, be moderate, be pacifistic, bend, capitulate, come round, comply, compromise, consent, die down, ease off, ebb, face the music, fall, forbear, forgive, give, give ground, give quarter, give way, go along with, have mercy upon, have pity, keep the peace, keep within bounds, keep within compass, knock under, knuckle down, knuckle under, let up, let up on, live temperately, live with it, melt, moderate, not make waves, not resist, obey, pardon, practice nonviolence, practice self-control, relax, remit, reprieve, resign, settle down, show mercy, show pity, slacken, sober down, soften, spare, strike a balance, submit, subside, succumb, swallow it, swallow the pill, take, take in sail, take it, take pity on, thaw, unbend, wane, yield
ROGET THESAURUS
relent
Moderation
VB
be moderate, keep within bounds, keep within compass, sober down, settle down, keep the peace, remit,
relent, take in sail, moderate, soften, mitigate, temper, accoy, attemper, contemper, mollify, lenify, dulcify, dull, take off the edge, blunt, obtund, sheathe, subdue, chasten, sober down, tone down, smooth down, weaken, lessen, check palliate, tranquilize, pacify, assuage, appease, swag, lull, soothe, compose, still, calm, calm down, cool, quiet, hush, quell, sober, pacify, tame, damp, lay, allay, rebate, slacken, smooth, alleviate, rock to sleep, deaden, smooth, throw cold water on, throw a wet blanket over, turn off, slake, curb, tame, smooth over, pour oil on the waves, pour oil on the troubled waters, pour balm into, mattre de l'eau dans son vin, go out like a lamb, roar you as gently as any sucking dove.
Pity
VB
pity, have pity, show pity, take pity, commiserate, compassionate, condole, sympathize, feel for, be sorry for, yearn for, weep, melt, thaw, enter into the feelings of, forbear,
relent, relax, give quarter, wipe the tears, parcere subjectis, give a coup de gr=ace, put out of one's misery, raise pity, excite pity, touch, soften, melt, melt the heart, propitiate, disarm, ask for mercy, supplicate, cry for quarter, beg one's life, kneel, deprecate.
Softness
VB
render soft, soften, mollify, mellow, relax, temper, mash, knead, squash, bend, yield,
relent, relax, give, plasticize'.