Related Clues:

• Least forward
• Coquettish in the extreme
• Most reserved
• Least straightforward
• Like the most subtle of flirts
• Maximally shrinking
• Most modest
• Least forthcoming
• Flirtatious to the max
• Most demure
• Least brazen
• Very modest, I agree, in bed
• At the extreme of retiring
• Most coquettish
• Maximally modest