Superlative form of honest: most honest.(adjective)
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Use "honestest" in a sentence
"Old man Jacob Gideon, received the boy Thomas from the Orphans 'Court, a bound apprentice, and reared him to manhood; and if still living, doubtless, yet thinks that Thomas is the "honestest" man he ever saw."
""The 'honestest' playing in all the world; not the political game, not the money game, not anything called manly sport, just a day off with my boys, being a boy again."
"Poland, he is the best servitor, and the honestest fellow, saith"