Definition of well-sustained in US English:

well-sustained

adjective

  • Skilfully or pleasingly sustained or prolonged; that maintains a high quality or intensity continuously or without interruption over an extended period.

Origin

Mid 18th century; earliest use found in Edward Young (bap. 1683, d. 1765), writer. From well + sustained.

Pronunciation

well-sustained

/ˌwɛlsəˈsteɪnd/