disheartening (adj.)

• alarming
• awing
• black
• bleak
• chilling
• daunting
• depressant
• depressing
• depressive
• despondent
• deterrent
• disappointing
• disconcerting
• discouraging
• dismal
• dismaying
• dispiriting
• displeasing
• disquieting
• dissatisfactory
• down
• dreary
• fearful
• fearsome
• frightening
• frightful
• funereal
• inadequate
• incommensurate
• insufficient
• oppressive
• pessimistic
• scary
• somber
• startling
• ungratifying
• unsatisfactory
• unsatisfying