Definition of non-proficiency in English:

non-proficiency

noun

rare
  • Lack of proficiency; failure to make progress or improve; unskilfulness.

Origin

Late 16th century; earliest use found in Gabriel Harvey (c1552–1631), scholar and writer. From non- + proficiency.

Pronunciation

non-proficiency

/ˌnɒnprəˈfɪʃnsi/