amateur
amateurish
inexpert
unskilled
everyday
improper
incompetent
inefficient
inexperienced
inferior
lax
lay
low-quality
negligent
ordinary
plain English
poor
second-rate
semiskilled
shoddy
sloppy
unaccomplished
unbecoming
unbefitting
unbusinesslike
uncoached
understandable
undignified
unendowed
unethical
unfinished
unfitting
ungifted
uninitiated
unpolished
unprepared
unprimed
unprincipled
unscholarly
unschooled
unseemly
untalented
untaught
untrained
untutored
unworthy
ambivalent
disorganize
disproportionate
illogical
impractical
inaccurate
inappropriate
inequitable
insensitive
unacceptable
unconventional
unfair
uninformed
unorthodox
unrealistic
unreliable
unremarkable
unscientific
unsuitable
unwise
concessional
confessional
congressional
nonprofessional
obsessional
processional
professional