unrelenting
adjective
[ ʌnrɪˈlɛntɪŋ ]
• not yielding in strength, severity, or determination.
• "the heat was unrelenting"
Similar:
implacable,
inflexible,
uncompromising,
unyielding,
unbending,
inexorable,
relentless,
resolute,
determined,
unstoppable,
dogged,
tireless,
unflagging,
unshakeable,
unswerving,
unwavering,
assiduous,
sedulous,
intransigent,
merciless,
pitiless,
unforgiving,
unsparing,
ruthless,
cruel,
rigid,
rigorous,
hard,
strict,
harsh,
stern,
adamant,
steely,
tough,
