unobtrusive
adj
(usuapprov 通常作褒義) not too obvious or easily noticeable; not drawing attention to itself or himself; discreet 不太顯著的; 不引人注目的; 不招搖的; 謹慎的
an unobtrusive but pleasing design 悅目而不扎眼的圖案
He was so quiet and unobtrusive that you would hardly know he was there! 他很文靜, 簡直注意不到他在那兒!