frank

blunt bold brazen direct familiar free heart-to-heart natural open plain real straight upright

aboveboard apparent artless bare-faced call a spade a spade candid down and dirty downright easy flat-out forthright from the hip guileless ingenuous lay it on the line like it is matter-of-fact naive outright outspoken plain-spoken saying what one thinks scrupulous sincere straightforward transparent truthful unconcealed undisguised uninhibited unreserved unrestricted up front

abnormal ambiguous different dishonest indirect lying unclear uncommon vague

devious evasive insincere secretive