Antonyms of adj aboveboard

1 sense of aboveboard

Sense 1
aboveboard, straightforward -- (without concealment or deception; honest; "their business was open and aboveboard"; "straightforward in all his business affairs")

INDIRECT (VIA straight) -> crooked, corrupt -- (not straight; dishonest or immoral or evasive)

Similarity of adj aboveboard

1 sense of aboveboard

Sense 1
aboveboard, straightforward -- (without concealment or deception; honest; "their business was open and aboveboard"; "straightforward in all his business affairs")
       => straight (vs. crooked), square -- (characterized by honesty and fairness; "straight dealing"; "a square deal")

Synonyms of adv aboveboard

1 sense of aboveboard

Sense 1
honestly, aboveboard -- (in an honest manner; "in he can't get it honestly, he is willing to steal it"; "was known for dealing aboveboard in everything")