adverb
1. obsolete : not thickly, not densely, not compactly
2. : not often : seldom
sometimes it is of clay, rarely of gold, most commonly of porcelain — Lafcadio Hearn
3. : with rare skill : beautifully , excellently
played so rarely on the flageolet — Sir Walter Scott
4. : in an exceptional degree : extremely , unusually
she was rarely beautiful