adverb
1.
Synonyms: occasionally , infrequently, irregularly, on occasion, sporadically
Antonyms: commonly
2.
Synonyms: extra , extremely, rarely, ||uncommon, unusually
UNCOMMONLY
Meaning of UNCOMMONLY in English
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003