If something is insufferable, it's unbearable and impossible, like the insufferable humidity of the "rain forest room" at the zoo on a hot summer day.

You can see the word suffer in insufferable — and it's no coincidence. If it's unacceptable or too much to handle, it's insufferable. An egotistic co-worker is insufferable, and so is a blizzard that leaves six-foot drifts against the doors of your house, or insufferable working conditions in many of the factories that produce goods around the world.

Definitions of insufferable

adj used of persons or their behavior

insufferable insolence”
impossible, unacceptable, unsufferable
intolerable, unbearable, unendurable
incapable of being put up with

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