Synonyms of unprofessional in English:

unprofessional


See definition of unprofessional

adjective

1‘she was reprimanded for unprofessional conduct’

SYNONYMS
improper, unethical, unprincipled, unscrupulous, dishonourable, disreputable, unseemly, unbecoming, unbefitting, indecorous, unworthy, lax, negligent
informal shady, crooked, not cricket
British informal dodgy

2‘he accused the detectives of being unprofessional and incompetent’

SYNONYMS
amateurish, amateur, unskilled, unskilful, inexpert, untrained, unqualified, inexperienced, unpractised, incompetent, sloppy, careless, slapdash, slipshod, shoddy, bungling, bumbling, blundering, second-rate, clumsy, crude, inefficient
informal cack-handed, cowboy