When you can't tolerate something, it's unendurable. The vintage camper your parents bought might smell so terrible that it's unendurable.

Use the adjective unendurable to describe situations that are truly impossible to bear, like the unendurable pain of losing a beloved friend. You can also use the word to emphasize the negative qualities of something: "This math class is unendurable — I'm transferring to modern dance." When you can endure something, you can stand it, even if it's hard. Endure comes from the Latin indurare, "make hard" or "harden the heart against."

Definitions of unendurable

adj incapable of being put up with

intolerable, unbearable
not permitted
very difficult to accept or bear
impossible, insufferable, unacceptable, unsufferable
used of persons or their behavior
not able to be supported or defended
capable of being borne or endured
allowable, permissible
that may be permitted especially as according to rule
bearable, endurable, sufferable, supportable
capable of being borne though unpleasant
resistant, tolerant
able to tolerate environmental conditions or physiological stress
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