The language of early Greek epic, exemplified primarily by Homer, contains numerous descriptions of inner states and uses a specific vocabulary to do so. Scholars understand these descriptions in a general way; but the precision of the expressions remains a mystery. In this work, one of the most important of these words, thumos, is examined in each of its contexts.This synchronic formulaic analysis is carried out according to the contexts of thumos: the cognitive/intellectual, the emotional, and the physical. Two additional contexts, deliberation and motivation, are discussed separately. Within the discussion of each context, the functional synonyms of thumos, particulary phren/phrenes, and other frequent associates of thumos, are examined. Thumos has associations with words relating to winds and storms, a fact which helps clarify its significance in all contexts.Because this work is a discussion of thumos in all contexts, and also contains an appendix of the relevant passages, it should be useful to scholars engaged in research on Homeric vocabulary.