Related Clues:

• Slick, in a way
• Dangerous, as some driving conditions
• Slow to mix, say
• Unpleasant, in a way
• Hazardous, in a way
• Like winter sidewalks, sometimes
• Not mixing well
• Like many Canadian roads in winter
• Dangerous to walk on, in a way
• Not likely to make the first move
• Unfriendly, as a stare
• Reluctant to meet people, say
• Start suddenly
• 'Once bitten, twice ___'
• Reluctant to mix