uncomplimentary (adj.)

• depreciative
• depreciatory
• disadvantageous
• disappointed
• disapproving
• discontented
• disenchanted
• disgruntled
• disillusioned
• disparaging
• displeased
• dissatisfied
• dissenting
• indignant
• low
• opposed
• opposing
• pejorative
• poor
• slighting
• unappreciative
• unfavorable
• unhappy