› literary disapproving A false friend is not loyal or cannot be trusted.
false adjective [not gradable]
› not correct or true: "Three plus three is seven. True or false?" "False." Note: said about information or an idea
by or under false pretences › if you do or get something by or under false pretences, you do or get it dishonestly by telling lies: The official was convicted of obtaining property by false pretences. Two executives had gained access to their rival's business plan under false pretences.