uncommonly

uncommon +‎ -ly

uncommonly (comparative more uncommonly, superlative most uncommonly)

1. To an uncommon degree; unusually or extremely.
   • 2012, Jeannie Lin, My Fair Concubine, page 12:

     For a gentleman, he was uncommonly rude, but she supposed wearing silk and jade gave him that privilege.

2. Not often; on rare occasions.

   Not uncommonly, I find that I have arrived too late to catch my train.

• (to an uncommon degree): atypically, unwontedly; see also Thesaurus:unusually
• (not often): sometimes, sporadically; see also Thesaurus:occasionally and Thesaurus:rarely