The quality or state of being endurable; the capacity to be tolerated or borne without becoming unbearable.
From 'endurable' plus '-ness' suffix (from Old English '-nes'), forming an abstract noun describing the quality of being endurable.
Stacking '-able' and '-ness' together creates a formal, philosophical tone—'endurableness' appears in older ethical writing when discussing whether suffering or hardship has an acceptable limit.
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