Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb reason

3 senses of reason

Sense 1
reason, reason out, conclude -- (decide by reasoning; draw or come to a conclusion; "We reasoned that it was cheaper to rent than to buy a house")
       => think, cogitate, cerebrate -- (use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments; "I've been thinking all day and getting nowhere")

Sense 2
argue, reason -- (present reasons and arguments)
       => present, represent, lay out -- (bring forward and present to the mind; "We presented the arguments to him"; "We cannot represent this knowledge to our formal reason")

Sense 3
reason -- (think logically; "The children must learn to reason")
       => think, cogitate, cerebrate -- (use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments; "I've been thinking all day and getting nowhere")

Antonyms of adj reasoned

1 sense of reasoned

Sense 1
reasoned, sound, well-grounded -- (logically valid; "a sound argument")

INDIRECT (VIA valid) -> invalid -- (having no cogency or legal force; "invalid reasoning"; "an invalid driver's license")

Similarity of adj reasoned

1 sense of reasoned

Sense 1
reasoned, sound, well-grounded -- (logically valid; "a sound argument")
       => valid (vs. invalid) -- (well grounded in logic or truth or having legal force; "a valid inference"; "a valid argument"; "a valid contract")