noun Etymology: alteration of metal Date: 1581 1. vigor and strength of spirit or temperament , staying quality ; stamina , quality of temperament or disposition , see: courage ~d adjective
METTLE
Meaning of METTLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012