Meaning

noun a flaw or weak point

noun powerlessness revealed by an inability to act

noun the property of lacking physical or mental strength; liability to failure under pressure or stress or strain

originFrom Middle English wayknesse, weykenesse, replacing earlier Middle English wocnesse, wakenes, wacnesse (“weakness”), from Old English wācnes (“weakness”). Equivalent to weak + -ness.

Etymology from Wiktionary, CC BY-SA 3.0