1. most lacking fresh air; most poorly ventilated
Usage: superlative form of stuffy
2. most formal and old-fashioned in attitude or behavior; most pompous
Usage: superlative form of stuffy; informal

Examples

• The basement was the stuffiest room in the entire house.
• We opened all the windows to air out the stuffiest areas.
• He was considered the stuffiest professor in the department.
• The country club had the stuffiest dress code in town.
• Even the stuffiest critics praised the young artist’s work.
• The stuffiest traditions were finally being questioned.