I. adjective
1.
Synonyms: expressive , eloquent, facund, meaningful, pregnant, rich, sententious
Related Word: cogent, compelling, convincing, sound, telling, valid; forceful, powerful; important, momentous, weighty
Contrasted words: meaningless, unexpressive; unimportant
Antonyms: insignificant
2.
Synonyms: important 1, big, consequential, considerable, material, meaningful, momentous, substantial, weighty
Contrasted words: inconsequential, meaningless, unimportant
Antonyms: insignificant
II. noun
Synonyms: indication 3, evidence, index, indicia, mark, sign, symptom, token