over-intellectualize
/ˌəʊv(ə)rɪntɪˈlɛktʃʊəlʌɪz/ /ˌəʊv(ə)rɪntɪˈlɛktʃ(ʊ)lʌɪz/ /ˌəʊv(ə)rɪntɪˈlɛktjʊəlʌɪz/verb
[with object] To make too intellectual; to treat in an excessively rational, unspontaneous way.
Origin
Early 20th century; earliest use found in William Dean Howells (1837–1920), author. From over- + intellectualize, after over-intellectual.