Finical is probably an extension of fine + -ical, in the sense of being over-refined or excessively particular; the related form finicky is a later variant. Morphologically, the account is both compositional and suffixal: -ical marks the visible structure by which the older base becomes the modern form. In present use, it is used as an adjective meaning "excessively fussy or fastidious about details", so the historical material remains connected with the current sense rather than standing as bare ancestry. The wider English family includes derivatives such as finically and finicalness and related forms such as finicky and fine, showing how the same historical material continues to organize neighboring vocabulary. Its semantic neighborhood is marked by fastidious, fussy, finicky, and particular on one side and contrasts such as careless, slovenly, and easygoing on the other, locating the modern specialization without adding a new origin story.