1 to give someone a false idea about something:

Her pleasant manner belied her true character.

2 to show that something cannot be true or real:

His cheerful smile belied his words.

(longman.com)

1. To picture falsely; misrepresent: “He spoke roughly in order to belie his air of gentility”

2. To show to be false: Their laughter belied their outward grief. in other words they laughed to pretend they weren’t sad

3. To be counter to; contradict: At first glance, life at the boarding school seemed to belie all the bad things I had heard about it.

K x

tr.v., -lied, -ly·ing, -lies.

To give a false representation to; misrepresent: “He spoke roughly in order to belie his air of gentility” (James Joyce).

To show to be false; contradict: Their laughter belied their outward grief.

[Middle English bilien, from Old English belēogan, to deceive with lies.]

belier be·li’er n.

Belie means to be a dead giveaway; to indicate.

be in contradiction with

represent falsely: “This statement misrepresents my intentions”

another word to say the same thing would be misrepresent or contradict.

# contradict: be in contradiction with

# misrepresent: represent falsely; “This statement misrepresents my intentions”