Sustained1. (imp. & p. p.) of Sustain.
2. (a.) Held up to a certain pitch, degree, or level; uniform; as, sustained passion; a sustained style of writing; a sustained note in music.
Thesaurus Entries
abiding, based on, bolstered, borne, braced, buttressed, ceaseless, changeless, chattering, constant, continual, continued, continuing, continuous, durable, enduring, even, firm, fixed, founded on, frozen, grounded on, guyed, held, immobile, immutable, incessant, indefatigable, intact, interminable, inviolate, lasting, level, machine gun, maintained, oscillating, perennial, permanent, perpetual, persistent, prolonged, propped, pulsating, quiescent, rapid, regular, remaining, repeated, rigid, shored up, solid, stable, staccato, static, stationary, stayed, staying, steadfast, steady, sticking, stuttering, supported, torpid, unaltered, unbroken, unceasing, unchangeable, unchanged, unchanging, unchecked, undestroyed, undying, unfading, unfailing, uniform, unintermitted, unintermittent, unintermitting, uninterrupted, unremitting, unshifting, unstopped, unvaried, unvarying, upheld, vibrating