primly

/ˈprɪmli/
adverb
  1. In a very proper, formal, or neat way, often showing disapproval of anything informal or messy.
    • She sat primly on the edge of the chair, her hands folded in her lap.
    • The old letters were arranged primly in a box, each tied with a ribbon.
    • He primly adjusted his tie before entering the meeting room.