Protracted

Verb
protracted

Adjective

 * 1) Lasting for a long time or longer than expected or usual.
 * a protracted and bitter dispute

Adverbs for Protracted
unendurably; endlessly; foolishly; tragically; unhappily; purposely; wickedly; painfully; tiresomely; drearily; unbearably; miserably; wearily; hopelessly; inexplicably; unaccountably; deliberately; purposely; intentionally; distressingly; viciously; lengthily; interminably; unendurably.

Thesaurus
de longue haleine, dragged out, dragging, drawn, drawn out, drawn-out, elongated, endless, everlasting, extended, filled out, interminable, languishing, lasting, lengthened, lengthy, lingering, long, long-continuing, long-drawn, long-drawn-out, long-pending, long-spun, long-winded, longiloquent, longsome, marathon, never-ending, overlong, padded, prolix, prolongated, prolonged, pulled, spun out, spun-out, straggling, strained, stretched, stretched out, stretched-out, strung out, talkative, taut, tense, tight, unrelenting, verbose, windy, wordy