Definition of stolid adjective from the Oxford Advanced Learner's Dictionary

 

stolid

 adjective
adjective
BrE BrE//ˈstɒlɪd//
 
; NAmE NAmE//ˈstɑːlɪd//
 
(usually disapproving)
 
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not showing much emotion or interest; remaining always the same and not reacting or changing Mark sat stolid and silent. She looked up at her stolid employer and wished he would unbend just a little. Word Origin late 16th cent.: from obsolete French stolide or Latin stolidus (perhaps related to stultus ‘foolish’).
See the Oxford Advanced American Dictionary entry: stolid