PROLONGED

elongated, extended, lengthened, prolonged

(adjective) drawn out or made longer spatially; “Picasso’s elongated Don Quixote”; “lengthened skirts are fashionable this year”; “the extended airport runways can accommodate larger planes”; “a prolonged black line across the page”

extended, drawn-out, lengthy, prolonged, protracted

(adjective) relatively long in duration; tediously protracted; “a drawn-out argument”; “an extended discussion”; “a lengthy visit from her mother-in-law”; “a prolonged and bitter struggle”; “protracted negotiations”

Source: WordNet® 3.1

Adjective

prolonged (comparative more prolonged, superlative most prolonged)

lengthy in duration; extended; protracted.

Synonyms

• enduring, longsome; see also lasting

Antonyms

• brief, temporary; see also ephemeral

Verb

prolonged

simple past tense and past participle of prolong

Source: Wiktionary

PROLONG

Pro*long", v. t. [imp. & p. p. Prolonged; p. pr. & vb. n. Prolonging.] Etym: [F. prolonger, L. prolongare; pro before, forth + longus long. See Long, a., and cf. Prolongate, Purloin. ]

1. To extend in space or length; as, to prolong a line.

2. To lengthen in time; to extend the duration of; to draw out; to continue; as, to prolong one's days. Prolong awhile the traitor's life. Shak. The unhappy queen with talk prolonged the night. Dryden.

3. To put off to a distant time; to postpone. Shak.

Source: Webster’s Unabridged Dictionary 1913 Edition