Seemingly endless or lasting so long that it feels unbearably long; tediously long and seemingly without end.
From Latin 'interminabilis'—'in' (not) plus 'terminabilis' (able to be ended), from 'terminus' (boundary, end). The word entered English in the 15th century to describe things without apparent limits.
The 'terminus' root gives us 'terminal,' 'determine,' and 'terminator'—all about endings and boundaries, so 'interminable' literally means 'not having a terminus,' which captures perfectly that feeling when a boring meeting just won't end!
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