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
  1. adjective
    uninterrupted in time and indefinitely long continuing
    unremitting demands of hunger”
    synonyms: ceaseless, constant, incessant, never-ending, perpetual, unceasing
    continuous, uninterrupted
    continuing in time or space without interruption
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