Somewhat like ether; having a slight quality of being ethereal, light, or immaterial.
From 'ether' plus the diminutive or qualitative suffix '-ish' (somewhat, having the quality of). A colloquial or informal formation that appears in poetry and descriptive writing.
The suffix '-ish' is magical—it lets you make almost any word into 'kind of' that thing, so 'etherish' means 'sort of dreamy and floaty,' which is exactly how English speakers naturally describe vague impressions.
Complete word intelligence in one call. Free tier — 50 lookups/day.