Antonyms of adj significant

4 senses of significant

Sense 1
significant (vs. insignificant), important -- (important in effect or meaning; "a significant change in tax laws"; "a significant change in the Constitution"; "a significant contribution"; "significant details"; "statistically significant")

insignificant (vs. significant), unimportant -- (devoid of importance, meaning, or force)
        => hole-and-corner, hole-in-corner -- (relating to the peripheral and unimportant aspects of life; "a hole-and-corner life in some obscure community"- H.G.Wells)
        => flimsy, fragile, slight, tenuous, thin -- (lacking substance or significance; "slight evidence"; "a tenuous argument"; "a thin plot"; a fragile claim to fame")
        => inappreciable -- (too small to make a significant difference; "inappreciable fluctuations in temperature")
        => light -- (having little importance; "losing his job was no light matter")
        => superficial, trivial -- (of little substance or significance; "a few superficial editorial changes"; "only trivial objections")

Sense 2
significant, substantial -- (fairly large; "won by a substantial margin")

INDIRECT (VIA considerable) -> inconsiderable -- (too small or unimportant to merit attention; "passed his life in an inconsiderable village"; "their duties were inconsiderable"; "had no inconsiderable influence")

Sense 3
significant (vs. nonsignificant) -- (too closely correlated to be attributed to chance and therefore indicating a systematic relation; "the interaction effect is significant at the .01 level"; "no significant difference was found")

nonsignificant (vs. significant) -- (attributable to chance)

Sense 4
meaning (prenominal), pregnant, significant -- (rich in significance or implication; "a meaning look")

INDIRECT (VIA meaningful) -> meaningless, nonmeaningful -- (having no meaning or direction or purpose; "a meaningless endeavor"; "a meaningless life"; "a verbose but meaningless explanation")

Similarity of adj significant

4 senses of significant

Sense 1
significant (vs. insignificant), important -- (important in effect or meaning; "a significant change in tax laws"; "a significant change in the Constitution"; "a significant contribution"; "significant details"; "statistically significant")
       => momentous -- (of very great significance; "deciding to drop the atom bomb was a very big decision"; "a momentous event")
       => epochal, epoch-making -- (highly significant or important especially bringing about or marking the beginning of a new development or era; "epochal decisions made by Roosevelt and Churchill"; "an epoch-making discovery")
       => earthshaking, world-shaking, world-shattering -- (sufficiently significant to affect the whole world; "earthshaking proposals"; "the contest was no world-shaking affair"; "the conversation...could hardly be called world-shattering")
       => evidential, evidentiary -- (serving as or based on evidence; "evidential signs of a forced entry"; "its evidentiary value")
       => fundamental, profound -- (far-reaching and thoroughgoing in effect especially on the nature of something; "the fundamental revolution in human values that has occurred"; "the book underwent fundamental changes"; "committed the fundamental error of confusing spending with extravagance"; "profound social changes")
       => large -- (fairly large or important in effect; influential; "played a large role in the negotiations")
       => monumental -- (of outstanding significance; "Einstein's monumental contributions to physics")
       => noteworthy, remarkable -- (worthy of notice; "a noteworthy fact is that her students rarely complain"; "a remarkable achievement")
       => probative, probatory -- (tending to prove a particular proposition or to persuade you of the truth of an allegation; "evidence should only be excluded if its probative value was outweighed by its prejudicial effect")
       => operative -- (effective; producing a desired effect; "the operative word")
       => portentous, prodigious -- (of momentous or ominous significance; "such a portentous...monster raised all my curiosity"- Herman Melville; "a prodigious vision")
          Also See-> important#1, of import#1; meaningful#1

Sense 2
significant, substantial -- (fairly large; "won by a substantial margin")
       => considerable (vs. inconsiderable) -- (large or relatively large in number or amount or extent or degree; "a considerable quantity"; "the economy was a considerable issue in the campaign"; "went to considerable trouble for us"; "spent a considerable amount of time on the problem")

Sense 3
significant (vs. nonsignificant) -- (too closely correlated to be attributed to chance and therefore indicating a systematic relation; "the interaction effect is significant at the .01 level"; "no significant difference was found")

Sense 4
meaning (prenominal), pregnant, significant -- (rich in significance or implication; "a meaning look")
       => meaningful (vs. meaningless) -- (having a meaning or purpose; "a meaningful explanation"; "a meaningful discussion"; "a meaningful pause")

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