relentless
Without any letup
Relentless describes something that never stops or lets up.
A relentless pursuit continues without pause.
Relentless rain falls hour after hour.
The word often carries a negative charge—relentless pressure, relentless criticism—but can be admiring: Her relentless dedication finally paid off.
The root is relent, meaning to soften or yield, which the relentless thing refuses to do.
Violently intense or aggressive
- ferociousExtremely violent or aggressive
- overwhelmingIntensely excessive in force
- poundingForceful repeated striking
- batteringRepeated forceful striking
hammering · driving · pelting · torrential · barrage · onslaught · assault · bombardment
Refusing to give way
- tenaciousStubbornly determined to continue
- doggedStubbornly persevering
- unwaveringSteady and unchanging
- steadfastFirmly loyal, unshakeable
resolute · indomitable · stubborn · obstinate · adamant · unshakeable · unswerving · unfaltering
Incapable of wearying
- tirelessNever losing energy
- unflaggingPersistently energetic
- unweariedNot made tired
- industriousDevoted to steady effort
diligent · assiduous · energetic · vigorous · hardworking · persevering · unstoppable · driven
Showing no clemency
- ruthlessLacking any compassion
- pitilessLacking any compassion
- heartlessLacking pity or mercy
- unforgivingShowing no leniency
unsparing · cruel · brutal · harsh · savage · cold-blooded · callous · remorseless
fierce
Violently intense or aggressive
- ferociousExtremely violent or aggressive
- overwhelmingIntensely excessive in force
- poundingForceful repeated striking
battering · hammering · driving · pelting · torrential · barrage · onslaught · assault · bombardment · punishing
unyielding
Refusing to give way
- tenaciousStubbornly determined to continue
- doggedStubbornly persevering
- unwaveringSteady and unchanging
steadfast · resolute · indomitable · stubborn · obstinate · adamant · unshakeable · unswerving · unfaltering · immovable
indefatigable
Incapable of wearying
- tirelessNever losing energy
- unflaggingPersistently energetic
- unweariedNot made tired
industrious · diligent · assiduous · energetic · vigorous · hardworking · persevering · unstoppable · driven · dynamic
merciless
Showing no clemency
unforgiving · unsparing · cruel · brutal · harsh · savage · cold-blooded · callous · remorseless · implacable
- cold-heartedcallous, cold, cold-blooded, cold-hearted, cruel
- exhaustingdraining, taxing, tiring, exhausting, fatiguing
- Hard Workgrind, hustle, toil, effort, labor
- irritatingannoying, aggravating, bothersome, exasperating, frustrating
- tenacitydetermined, persistence, persistent, perseverance, determination
- toughnessgrit, stamina, endurance, tenacity, resilience
relentlessintermittent
Occurring at irregular intervals
sporadic · stopping · ceasing · occasional · periodic
relentlessmerciful
Disposed toward forgiveness
compassionate · forgiving · lenient · kind · sympathetic
relentlessyielding
Bending under pressure
surrendering · submissive · capitulating · weak-willed · spineless