1. superlative form of sullen; most bad-tempered, moody, or resentfully silent
Usage: superlative form

Examples

• Of all the teenagers, Jake was the sullenest after being grounded.
• She gave him the sullenest look when he interrupted her reading.
• The sullenest member of the group refused to participate in any activities.
• Even on the best days, he remained the sullenest person in the office.
• The sullenest expression crossed her face when she heard the news.