1. Extremely alarming
   - hair-raising, nightmarish

See also: alarming

• unwedded
• unwelcome
• unwelcome guest
• unwelcome person
• unwell
• unwellness
• unwholesome
• unwholesomeness
• unwieldiness
• unwieldy
• unwilled
• unwilling
• unwillingly
• unwillingness
• unwind
• unwire
• unwise
• unwisely
• unwiseness
• unwished
• unwished-for
• unwitting
• unwittingly
• unwomanly
• unwonted