sustained (adj.)

• abiding
• borne
• braced
• buttressed
• ceaseless
• changeless
• constant
• continual
• continued
• continuing
• continuous
• durable
• enduring
• even
• firm
• fixed
• frozen
• held
• immobile
• immutable
• incessant
• indefatigable
• intact
• interminable
• inviolate
• lasting
• level
• maintained
• oscillating
• perennial
• permanent
• perpetual
• persistent
• prolonged
• quiescent
• rapid
• regular
• remaining
• repeated
• rigid
• solid
• stable
• staccato
• static
• stationary
• steadfast
• steady
• sticking
• supported
• torpid
• unaltered
• unbroken
• unceasing
• unchangeable
• unchanged
• unchanging
• unchecked
• undying
• unfading
• unfailing
• uniform
• uninterrupted
• unremitting
• unvaried
• unvarying