Pronunciation: /faˈstɪdɪəs /
1 Very attentive to and concerned about accuracy and detail: she dressed with fastidious care
1.1 Very concerned about matters of cleanliness: the child seemed fastidious about getting her fingers dirty
late Middle English: from Latin fastidiosus, from fastidium 'loathing'. The word originally meant 'disagreeable', later 'disgusted'. Current senses date from the 17th century.
When ODO offers us "sloven", we decide to be fastidious
, instead. We do not wish to irritate the many WotD participants with clear and accurate memories. They would tell us that "sloven" was the word back on September 12, 2011. It would be careless to let a repeat slip through a mere 1071 days later.
Words are a game. Sometimes I play alone, but you are welcome to play, too.