In an accidental manner; unexpectedly; by chance; unintentionally; casually; fortuitously; not essentially.
                                                            
                                                     
                        
                                                
                        
                        
                            in an incidental manner; "these magnificent achievements were only incidentally influenced by Oriental models" 
                                                            
                                                     
                        
                                                
                        
                        
                            without intention; in an unintentional manner; "she hit him unintentionally"