1. superlative form of chilly; most cold or cool in temperature
2. superlative form of chilly; most unfriendly or unwelcoming in manner

Examples

• January is usually the chilliest month of the year.
• The basement was the chilliest room in the house.
• She gave him the chilliest look when he arrived late.
• The morning air felt chilliest just before sunrise.
• His response was the chilliest she had ever received.
• The chilliest winds came from the north.
• The teacher’s chilliest stare silenced the classroom.