Definition of "pernickety"

‘You must forgive me,’ he said. ‘I take a ridiculous pleasure in what I eat and drink. It comes partly from being a bachelor, but mostly from a habit of taking a lot of trouble over details. It’s very pernickety and old-maidish really, but then when I’m working I generally have to eat my meals alone and it makes them more interesting when one takes trouble.’

1953, Ian Fleming, chapter 8, in Casino Royale, page 48