all mental activity shy of emotion. - Not including emotion - mental activity that does not include emotion
Short; lacking: Eleven is one shy of a dozen.
shy: Definition, Synonyms from Answers.com
Student or Learner
A thought is: a notion, idea, memory, ... concepts of any kind, all mental activity shy of emotion.
What does "shy of" mean here?
Yes, here it is the opposite of beyond, a word we lack: Fr. en deša.