METHINKS

me ‧ thinks /mɪˈθɪŋks/ BrE AmE verb ( past tense methought /-ˈθɔːt $ -ˈθɒːt/) [transitive] old use

[ Language: Old English ; Origin: me thincth 'it seems to me' , from thyncan 'to seem' ]

I think:

Methinks he is not mistaken.