Spinoza, "do Not Weep, Do Not Wax __. Understand."

This page is the CodyCross answer for the clue below from Apothecary, Group 1975, Puzzle 4 (Care Strategies).

Question is: Spinoza, "do Not Weep, Do Not Wax __. Understand."

and the answer is: INDIGNANT

Word Meaning:

INDIGNANT — Showing anger or indignation, especially at something unjust or wrong.

Definitions from Wiktionary.