Synset

provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
<verb.communication>   freq. cnt.: 27 freq. cnt.: 10 freq. cnt.: 9 freq. cnt.: 4 freq. cnt.: 2 freq. cnt.: 2

attest

certify

demonstrate

evidence

manifest

sample sentences

"His high fever attested to his illness"
"The buildings in Rome manifest a high level of architectural sophistication"
"This decision demonstrates his sense of fairness"