Definition of thinkingness in English:

thinkingness

noun

  • The quality of thinking about things; thoughtfulness, intellectuality; the essence of a thinking being.

Origin

Late 17th century; earliest use found in Obadiah Walker (1616–1699), college head and author. From thinking + -ness.

Pronunciation

thinkingness

/ˈθɪŋkɪŋnɪs/