"nitty : Full of nits. (chiefly Britain, slang) Foolish, inane. […] (Excessively) detailed,..."

“nitty : Full of nits.
(chiefly Britain, slang) Foolish, inane. […]
(Excessively) detailed, specific; fastidious, fussy, nit-picky.
(poker slang) Of a poker player: playing in an overly cautious and reactive manner. […]
(obsolete, rare) Shining; elegant, spruce.”

- https://en.wiktionary.org/wiki/nitty#English

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