c. 1600, from Latin quiescentem (nominative quiescens), present participle of quiescere, inchoative verb formed from quies "rest, quiet" (from suffixed form of PIE root *kweie- "to rest, be quiet").
the quiescent level of centimeter wave-length solar radiation
the quiescent melancholy of the town
a quiescent tumor
quid pro quo
quiddity
quidnunc
quiesce
quiescence
quiescent
quiet
quieten
quietism
quietude
quietus
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