Meaning

noun any of various plants of various genera of the family Compositae having flowers that can be dried without loss of form or color

adjective continuing forever or indefinitely

adjective without qualification; used informally as (often pejorative) intensifiers

originFrom Middle English ever-lasting (“(adjective) eternal, perpetual; constant; (adverb) eternally; (noun) eternity”), from ever (“at all times, always, constantly; eternally, perpetually; regularly; etc.”) + lasting (“continuing, lasting; eternal; etc.”). * Ever is derived from Old English ǣfre (“ever”), possibly from ā (“always, ever”) + in fēore (“in life”). Ā is from Proto-West Germanic *aiw…

Etymology from Wiktionary, CC BY-SA 3.0