Synonym for relent is "ease off"

melt [verb]

means "action"
relent, mollify, relax, soften, gentle, sweeten

- conjugate verb melt

relax [verb]

means "action"
ease, ease off, relent, soften

- conjugate verb relax

soften [verb]

means "relax"
bend, yield, relent, give

- conjugate verb soften

succumb [verb]

means "yield"
give way, submit, give in, concede, accede, relent

- conjugate verb succumb

thaw [verb]

means "relax"
loosen, relent, mollify

- conjugate verb thaw

relentless [adjective]

means "severe"
adamant, austere, callous, cruel, exacting, harsh, hard

relentlessly [object]

means "in cold blood"
deliberately, cruelly, willfully, with malice aforethought

adamant [adjective]

means "resolute"
relentless

bitter [adjective]

means "property"
virulent, relentless

cruel [adjective]

means "behaviour"
relentless

hard [adjective]

means "behaviour"
harsh, relentless

importunate [adjective]

means "unrelenting"
tenacious, persistent, determined, obstinate, relentless, insistent

inclement [adjective]

means "severe"
harsh, cruel, bitter, unrelenting, hard, relentless

ineluctable [adjective]

means "inevitable"
inescapable, unavoidable, relentless, unswerving, certain

insistent [adjective]

means "unrelenting"
tenacious, persistent, determined, obstinate, relentless, importunate

irresistible [adjective]

means "overwhelming"
inexorable, compelling, irrepressible, overpowering, powerful, relentless

overpowering [adjective]

means "overwhelming"
uncontrollable, irresistible, compelling, irrepressible, inexorable, relentless

overwhelming [adjective]

means "overpowering"
uncontrollable, irresistible, compelling, irrepressible, inexorable, relentless

ruthless [adjective]

means "savage"
relentless

set [adjective]

means "property"
relentless

- translate set

severe [adjective]

means "behaviour"
uncompromising, unbending, inflexible, rigid, exacting, relentless

unforgiving [adjective]

means "revengeful"
relentless, shameful, awful, terrible, hurting, ruthless

unyielding [adjective]