1.altruism
noun: the quality of unselfish concern for the welfare of others
Albert Schweitzer spent most of his life doing missionary work as a doctor in Africa, seeking no reward, apparently motivated only by altruism.
2.perquisite
noun: a right reserved exclusively by a particular person or group (especially a hereditary or official right)
Even as the dishwasher at the French restaurant, Josh quickly learned that he had the perquisite of being able to eat terrific food for half the price diners would pay.
3.finagle
verb: achieve something by means of trickery or devious methods
Steven was able to finagle one of the last seats on the train by convincing the conductor that his torn stub was actually a valid ticket.
4.impregnable
adjective: immune to attack; incapable of being tampered with
As a child, Amy would build pillow castles and pretend they were impregnablefortresses.
5,errant
adjective: to be wandering; not sticking to a circumscribed path
Unlike his peers, who spent their hours studying in the library, Matthew preferred errant walks through the university campus.