low–key

not excessively showy hoping to make a good impression, he deliberately chose a low-key tie with a subtle pattern Synonyms conservative, low-key (also low-keyed), muted, repressed, restrained, sober, subdued, toned-down, understated, unflashy, unpretentiousRelated Words appropriate, becoming, fit, fitting, proper, suitable; modest, plain, simple, unadorned, undecorated; inconspicuous, unnoticeable, unobtrusive; graceful, handsome, refined, tasteful; drab, mousy (or mousey); practical, sensibleNear Antonyms meretricious; graceless, inelegant, tacky, tasteless, tawdry, trashy, vulgar; baroque, fancy, frilly, gilded (or gilt), ornate, rococo; overdecorated, overdone, overwroughtAntonyms flamboyant, flaring, flashy, garish, gaudy, glitzy, loud, noisy, ostentatious, razzle-dazzle, splashy, swank (or swanky)