adjective
Lasting or enduring forever; endless, eternal.
Continuing for a long period; eternal.
Happening all the time, especially to a tiresome extent; constant, incessant, unending.
Of clothing or fabric: lasting a long time; very durable or hard-wearing.
Chiefly in the name of a plant:
Used as an intensifier.
adverb
Synonym of everlastingly.
noun
(countable, botany) Chiefly with a descriptive word: short for everlasting flower (“any of several plants, chiefly of the family Asteraceae (principally the tribe Gnaphalieae), having flowers that retain their colour and form when dried; also, a flower of such a plant”)
(countable, archaic) Preceded by the: someone or something that lasts forever, or that that has always existed and will continue to exist forever; an eternal, an immortal; specifically (Christianity), God.
Synonym of lasting (“(uncountable) a durable, plain, woven fabric formerly used for making clothes and for the uppers of women's shoes; (countable) a quantity of such fabric”).
Short for everlasting trimming (“(uncountable) an embroidered edging used on underclothes; (countable) a quantity of such edging”)