na. | 1. act as if there was no one else present -- self-assured or supercilious; act as if no one was nearby -- an unwarranted assumption of airs; act or talk in a supercilious manner; as if nobody else besides oneself counts; as if nobody were near him; as if no one was about; as if there was nobody present; as though no one were nearby; completely informal; have no regard for others |