Meaning

adjective not capable of being precisely or readily described; not easily put into words

adjective defying expression or description

originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in-bor. Middle English in- English in- English define Proto-Indo-European *-tḗr Proto-Indo-European *-dʰlom Proto-Indo-European *-dʰlis Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English definable English indefinable From in- + definable.

Etymology from Wiktionary, CC BY-SA 3.0