her crest with "wannish
fire/Sprinkled with stars" (Keats 1970: 162), and, more than everything, her strange mixture of woman and serpent, amaze.
Upon her crest she wore a wannish
fire Sprinkled with stars, like Ariadne's tiar: Her head was serpent, but ah, bitter-sweet!
In late ME, this suffix is attached to adjectives and has the sense 'somewhat': blakish, bleuish, derkish, dullish,fattish, grenish, redish, saltish, wannish
Toward the end of the poem the speaker's location is revealed to those who know: See, the dawn shivers round the grey gilt-dialled towers, and the rain Streams down each diamonded pane and blurs with tears the wannish