Antonyms of adj tautological

1 sense of tautological

Sense 1
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 tautological

1 sense of tautological

Sense 1
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")