thankless
ungrateful
unthankful
against
con
disappointed
disapprobatory
disapproving
discontented
disenchanted
disgruntled
disillusioned
displeased
dissatisfied
dissenting
inappreciative
indignant
low
opposed
opposing
poor
turned-off
unapplausive
unapproving
uncomplimentary
unfavorable
unhappy
unmindful
double-faced
hipper
inapt
inattentive
inhumane
invidious
neglectful
snot-nosed
tuppenny
unbusinesslike
uncaring
uncomprehending
unenlightened
unfitted
unimpressionable
uninterested
unkind
unmeritorious
unmethodical
unmusical
unobservant
unprosperous
unsympathetic
unteachable
appreciative