Antonyms of adj cogent

1 sense of cogent

Sense 1
cogent, telling, weighty -- (powerfully persuasive; "a cogent argument"; "a telling presentation"; "a weighty argument")

INDIRECT (VIA persuasive) -> dissuasive -- (deterring from action; "dissuasive advice"; "made a slight dissuasive gesture with her hand")

Similarity of adj cogent

1 sense of cogent

Sense 1
cogent, telling, weighty -- (powerfully persuasive; "a cogent argument"; "a telling presentation"; "a weighty argument")
       => persuasive (vs. dissuasive) -- (intended or having the power to induce action or belief; "persuasive eloquence"; "a most persuasive speaker"; "a persuasive argument")