modest

Having or showing a moderate estimation of one's own abilities, accomplishments, or value.

Having or proceeding from a disinclination to call attention to oneself; retiring or diffident.

Observing conventional proprieties in speech, behavior, or dress, especially in the avoidance of arousing sexual interest.

Free from showiness or ostentation; unpretentious: synonym: plain.

Moderate or limited in size, quantity, or range; not extreme.