1) Artless 2) Down to earth 3) Homespun 4) Modest 5) Simple 6) Tasteful 7) Unassuming 8) Understated 9) Unostentatious 10) Unpompous 11) Unpretending 1) Honest 2) In good taste 3) Modest 4) Not ostentatious 5) Not pretentious 6) Plain 7) Tasteful 8) Unpompous 9) Without ostentatious display 
[adj] - lacking pretension or affectation
adjective lacking pretension or affectation; `an unpretentious country church`; `her quiet unpretentious demeanor`
not pretentious; modest; without ostentatious display; plain: his unpretentious demeanor; an unpretentious summer resort.
[SAT terms] lacking affectation