discouraging (adj.)

• admonitory
• alarming
• awing
• black
• bleak
• cautionary
• chilling
• daunting
• depressant
• depressing
• depressive
• deterrent
• disconcerting
• disheartening
• dismal
• dismaying
• dispiriting
• disquieting
• dissuasive
• down
• dreary
• fearful
• fearsome
• forbidding
• frightening
• frightful
• hindering
• intimidating
• monitory
• oppressive
• preclusive
• preventative
• preventive
• prohibitive
• prophylactic
• scary
• startling