adjective
1.
Synonyms: important 1, big, consequential, considerable, material, meaningful, significant, substantial, weighty
Antonyms: trivial
2.
Synonyms: epochal
adjective
1.
Synonyms: important 1, big, consequential, considerable, material, meaningful, significant, substantial, weighty
Antonyms: trivial
2.
Synonyms: epochal
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003