During a heat wave, it's not always the temperature itself that's a problem. It's that the heat is unremitting––you don't get a break from it. It's sweltering hot day after day after day.

You'd think the word unremitting would be connected to the word remit, but that's true in only a loose way. Remit means to send back––but if you remit a debt, you forgive it, or lift it. Unremitting describes something that is never lifted or sent back. Like the Energizer Bunny, it keeps coming and coming and coming.

Definitions of unremitting

adj uninterrupted in time and indefinitely long continuing

unremitting demands of hunger”
ceaseless, constant, incessant, never-ending, perpetual, unceasing
continuous, uninterrupted
continuing in time or space without interruption

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