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re‧lent‧less

1 strict, cruel, or determined, without ever stopping :
her relentless determination to succeed
a regime that was relentless in its persecution of dissidents
her relentless determination to succeed
a regime that was relentless in its persecution of dissidents2 something bad that is relentless continues without ever stopping or getting less severe [= endless]:
the relentless crying of a small baby
a family facing relentless financial problems
the relentless crying of a small baby
a family facing relentless financial problems —relentlessly adverb:
He questioned her relentlessly.
He questioned her relentlessly.