methinks

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++me·thinks /mɪˈθɪŋks/ verb (past tense methought /-ˈθɔːt $ -ˈθɒːt/) [transitive] old use  THINK ABOUTI think 我想，据我看来 Methinks he is not mistaken. 据我看来他没有弄错。

Examples from the Corpus

methinks• They do with every other side - somehow methinks scum will avoid that on the whole.Origin methinks Old English me thincth “it seems to me”, from thyncan “to seem”

me·thinks verbChineseSyllable  

Corpus I think

methinks
me‧thinks /mɪˈθɪŋks/ verb (past tense methought /-ˈθɔːt $ -ˈθɒːt/) [transitive] old useI think:
    Methinks he is not mistaken.

me·thinksBrE /mɪˈθɪŋks/ 🔊NAmE /mɪˈθɪŋks/ 🔊 verbpresent simple - I / you / we / they methinks BrE /mɪˈθɪŋks/ 🔊 NAmE /mɪˈθɪŋks/ 🔊past simple methought BrE /mɪˈθɔːt/ 🔊 NAmE /mɪˈθɔːt/ 🔊 (not used in the perfect tenses 不用于完成时) [intransitive, transitive] ~ (that)… (old use or humorous) I think 我想；我以为；据我看来