I. -lē, -li adverb
Etymology: Middle English maisterly, from maister master + -ly
: with the skill of a master : in a masterly fashion
II. adjective
Etymology: master (I) + -ly
1. obsolete : of or relating to a master or lord ; specifically : domineering
2. : suitable to or like that of a master : indicating thorough knowledge or superior skill and power
a masterly retreat
a masterly argument
masterly handling of a complex topic
Synonyms: see proficient