stodgiest
/ˈstoʊdʒɪst/Definitions
1. adjective
most dull and uninteresting, especially due to being too cautious or conventional
“The stodgiest members of the committee opposed the new proposal.”
2. superlative form of adjective
more dull and uninteresting than others
“The stodgiest of the three friends fell asleep during the movie.”