Synonyms of proficiency in English:

proficiency


See definition of proficiency

noun

1‘her proficiency was obvious to everyone who sailed with her’

SYNONYMS
skill, skilfulness, expertise, experience, ability, capability, capacity, competence, competency, adeptness, adroitness, excellence, mastery, prowess, professionalism, aptitude, deftness, dexterity, finesse, facility, effectiveness, accomplishment, aptness, expertness, talent
informal know-how
ANTONYMS

incompetence