“At these words the shadowy room swam before Yasmina’s affrighted gaze.”
-The People of the Black Circle
“affrighted the moon” is another use by Howard, in the novel Almuric.
1. frighten (someone):
late Middle English: in early use from āfyrhted ‘frightened’ in Old English; later by vague form association with fright.
affrighted (past tense)
affrighted (past participle)