openest
o-pen-est
adjective
Having the greatest degree of being accessible, frank, or exposed.
"It was the openest discussion we'd ever had."
Thesaurus
Synonyms: assailable, open, undefendable, undefended, vulnerable, unconstricted, clear, available, unenclosed, out-of-doors, outdoors, open air
Antonyms: close, close down, close up, closed, covert, fold, fold up, shut, shut down, turn up, unopen, unreceptive