honestest
hon-est-est
adjective
Possessing the highest degree of truthfulness, sincerity, and moral integrity among a group.
"She was the honestest person I had ever met."
Thesaurus
Synonyms: honorable, honest, downright, unpretentious, reliable, true, trusty, dependable, trustworthy, just, equitable, fair
Antonyms: dishonest, dishonorable