Synonyms: relentless, unrelenting, persistent
Definition: never-ceasing
Usage: the relentless beat of the drums
Similar words: continual
Definition: occurring without interruption; chiefly restricted to what recurs regularly or frequently in a prolonged and closely spaced series
Usage: the continual banging of the shutters
Synonyms: brutal, unrelenting
Definition: harsh
Usage: the brutal summer sun; a brutal winter
Similar words: intense
Definition: possessing or displaying a distinctive feature to a heightened degree
Usage: intense heat; intense anxiety; intense desire; intense emotion; the skunk's intense acrid odor; intense pain; enemy fire was intense
Synonyms: inexorable, grim, unrelenting, relentless, unappeasable, unforgiving, stern
Definition: not to be placated or appeased or moved by entreaty
Usage: grim determination; grim necessity; Russia's final hour, it seemed, approached with inexorable certainty; relentless persecution; the stern demands of parenthood