2 adjectives to describe quiristers

Now Phoebus' silver eye is drench'd in western deep, And Luna 'gins to show her splendent rays, And all the harmless quiristers of woods Do take repose, save only Philomel; Whose heavy tunes do evermore record With mournful lays the losses of her love.

so may the sparrows, in default of more melodious quiristers, unpoisoned hop about your walks!

2 adjectives to describe  quiristers