altruistic — If your behaviour or motives are altruistic, you show concern for the happiness and welfare of other people rather than for yourself.
humble — not proud or arrogant; modest: to be humble although successful.
modest — having or showing a moderate or humble estimate of one's merits, importance, etc.; free from vanity, egotism, boastfulness, or great pretensions.
reserved — kept in reserve; forming a reserve: a reserve fund; a reserve supply.
selfless — having little or no concern for oneself, especially with regard to fame, position, money, etc.; unselfish.
unpretentious — not pretentious; modest; without ostentatious display; plain: his unpretentious demeanor; an unpretentious summer resort.
