stul ‧ ti ‧ fy ‧ ing /ˈstʌltəfaɪ-ɪŋ, ˈstʌltɪfaɪ-ɪŋ/ BrE AmE adjective formal
[ Date: 1700-1800 ; Language: Late Latin ; Origin: stultificare 'to make stupid' , from Latin stultus 'stupid' ]
so boring that you feel as though you are losing your ability to think:
a stultifying office environment
—stultify verb [transitive]