not true or correct; erroneous

a false statement.

uttering or declaring what is untrue

a false witness.

not faithful or loyal; treacherous

a false friend.

tending to deceive or mislead; deceptive

a false impression.

not genuine; counterfeit.

based on mistaken, erroneous, or inconsistent impressions, ideas, or facts

false pride.

used as a substitute or supplement, esp. temporarily

false supports for a bridge.

Biology . having a superficial resemblance to something that properly bears the name

the false acacia.

not properly, accurately, or honestly made, done, or adjusted

a false balance.

inaccurate in pitch, as a musical note.

dishonestly; faithlessly; treacherously

Did he speak false against me?

play someone false

to betray someone; be treacherous or faithless.

adverb

honestly , truthfully

adverb

basely , behind one’s back * , crookedly , dishonestly , dishonorably , disloyally , faithlessly , falseheartedly , malevolently , maliciously , perfidiously , roguishly , traitorously , treacherously , underhandedly , unfaithfully , unscrupulously