The Collaborative International Dictionary
Wiktionary
                    altruistically
                    
                        
                
                                                                    adv. Regardful of others; beneficent; unselfish; -- opposed to egoistic or selfish.
WordNet
                    altruistically
                    
                        
                
                                                                    adv. in an altruistic manner; "he acted selflessly when he helped the old lady in distress" [syn: selflessly]
Usage examples of "altruistically".
And as David's friend, Chalmers was probably quite as embarrassed, altruistically, as David was on his own behalf.
Yes, he brawls and slays, but he also reflects and laughs – at himself as well as others – loves and loses, doubts and falters, acts altruistically and empathizes with alien beings.