ultrafastidious

/ˌʌltrəfæˈstɪdiəs/
adjective
  1. Extremely careful about small details; very difficult to please because of high standards of cleanliness, order, or accuracy.
    • My grandmother is ultrafastidious about her garden, weeding every single day to keep it perfect.
    • He is so ultrafastidious that he rechecks his emails three times before sending them.
    • The chef was ultrafastidious about the presentation of every dish, adjusting each garnish by millimeters.
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