simple past tense and past participle of sustain
lengthy in duration; extended; protracted.
Held continuously at a certain level.
simple past tense and past participle of prolong
(music) Held at a certain pitch.
relatively long in duration; tediously protracted;
‘a drawn-out argument’; ‘an extended discussion’; ‘a lengthy visit from her mother-in-law’; ‘a prolonged and bitter struggle’; ‘protracted negotiations’;
Held up to a certain pitch, degree, or level; uniform; as, sustained pasion; a sustained style of writing; a sustained note in music.
drawn out or made longer spatially;
‘Picasso's elongated Don Quixote’; ‘lengthened skirts are fashionable this year’; ‘the extended airport runways can accommodate larger planes’; ‘a prolonged black line across the page’;
maintained at length without interruption or weakening;
(of illness) developing slowly or of long duration
(of an electric arc) continuous;
‘heat transfer to the anode in free burning arcs’;