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English word finicky comes from English -ical, English fine, and later English finicking (Finicky behaviour; fussing Finical.)
-ical (English)
Used to form adjectives from nouns with the meaning "of or pertaining to"; adjectival suffix appended to various words, often nouns, to make an adjective form. Often added to words of Latin origin, but used with other words also.
fine (English)
(intransitive) To pay a fine.. (transitive) To issue a fine as punishment to (someone). (UK, legal) A sum of money or price paid for obtaining a benefit, favor, or privilege, as for admission to a copyhold, or for obtaining or renewing a lease.. (obsolete) End; conclusion; termination; extinction.. A final agreement concerning lands or rents between persons, as the lord and his vassal. A fee [...]
finical (English)
(student slang) Finicky, fastidious, overly precise or delicate.
finicking (English)
Finicky behaviour; fussing Finical.
finicky (English)
(informal) Demanding, requiring above-normal care.. (informal) Fastidious and fussy; difficult to please; exacting, especially about details.