Antonyms of adj redundant

2 senses of redundant

Sense 1
excess, extra, redundant, spare, supererogatory, superfluous, supernumerary, surplus -- (more than is needed, desired, or required; "trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ornamentation"; "it was supererogatory of her to gloat"; "delete superfluous (or unnecessary) words"; "extra ribs as well as other supernumerary internal parts"; "surplus cheese distributed to the needy")

INDIRECT (VIA unnecessary) -> necessary -- (absolutely essential)

Sense 2
pleonastic, redundant, tautologic, tautological -- (repetition of same sense in different words; "`a true fact' and `a free gift' are pleonastic expressions"; "the phrase `a beginner who has just started' is tautological"; "at the risk of being redundant I return to my original proposition"- J.B.Conant)

INDIRECT (VIA prolix) -> concise -- (expressing much in few words; "a concise explanation")

Similarity of adj redundant

2 senses of redundant

Sense 1
excess, extra, redundant, spare, supererogatory, superfluous, supernumerary, surplus -- (more than is needed, desired, or required; "trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ornamentation"; "it was supererogatory of her to gloat"; "delete superfluous (or unnecessary) words"; "extra ribs as well as other supernumerary internal parts"; "surplus cheese distributed to the needy")
       => unnecessary (vs. necessary), unneeded -- (not necessary)

Sense 2
pleonastic, redundant, tautologic, tautological -- (repetition of same sense in different words; "`a true fact' and `a free gift' are pleonastic expressions"; "the phrase `a beginner who has just started' is tautological"; "at the risk of being redundant I return to my original proposition"- J.B.Conant)
       => prolix (vs. concise) -- (tediously prolonged or tending to speak or write at great length; "editing a prolix manuscript"; "a prolix lecturer telling you more than you want to know")