IPA: /fɪˈnɪkɪnɪs/
KK: /fɪˈnɪkɪnɪs/
The quality of being very particular about details or being hard to please.
Her finickiness about food made it difficult to find a restaurant that she liked.
Finickiness is derived from "finicky" (from the 19th-century American English, possibly influenced by the word "finical", which comes from the Scottish "finical", meaning overly particular or fussy) and the suffix "-ness" (meaning the state or quality of). The word describes the state of being overly particular or fussy about details.
Think of someone who is overly particular or fussy about things — that's what finickiness means, reflecting the quality of being finicky.