long–term

lasting for a considerable time before approving a new drug, the government insists on some long-term research to determine any possible side effects Synonyms extended, far, great, lengthy, long-drawn-out (or long-drawn), long-lived, long-termRelated Words aeonian (or aeonic), endless, everlasting, interminable, persistent; longish, overlong, prolonged, protracted; permanent; all-day, all-night; multiday, multiyearNear Antonyms abrupt, sudden; abbreviated, condensed, curtailed, shortened; ephemeral, fleeting, momentary, transient, transitory; impermanent; short-rangeAntonyms brief, little, mini, short, shortish, short-lived, short-term