1) Answer to some objections 2) Chronic 3) Constant 4) Continual 5) Continuous 6) Endless 7) Lasting 8) Like many objections 9) Never-ending 10) Nonstop 11) Perpetual 12) Persistent 13) Prolonged 14) Repeated 15) Unbroken 16) Unceasing 17) Uninterrupted 18) Unrelenting 19) Unremitting 1) Borne 2) Continuous 3) Fed 4) Held 5) Keptalive 6) Upheld 7) Tenuto 
• (a.) Held up to a certain pitch, degree, or level; uniform; as, sustained pasion; a sustained style of writing; a sustained note in music. • (imp. & p. p.) of Sustain
the use of this word in the dance field usually refers to its meaning inside the frame of Rudolph Labans effort-shape theory. Sustained is an effort quality that can be applied to the execution of the main factor TIME (see the definition of Dynamics above to expand). One way of understanding this quality of effort is to think that Lab...
Sus·tained' adjective Held up to a certain pitch, degree, or level; uniform; as, sustained pasion; a sustained style of writing; a sustained note in music. 
[adj] - maintained at length without interruption or weakening
adjective maintained at length without interruption or weakening; `sustained flight`
continued at length without interruption or weakening