English edit

Etymology edit

sub- +‎ professional

Adjective edit

subprofessional (comparative more subprofessional, superlative most subprofessional)

  1. Not meeting the quality standards expected of a professional.
    His subprofessional workmanship led me to decide to never hire him again.

Noun edit

subprofessional (plural subprofessionals)

  1. A person working at less than professional level.