adverb. ['ˈmaɪtəli'] (Southern regional intensive) very; to a great degree.
1. Adverb If it froths up mightily, your yeast is still healthy and ready to use.
1. These people walk by a widow deformed by leprosy...walk by children dressed in rags living in the street, and they think, 'Business as usual.' But if they perceive a slight against God, it is a different story. Their faces go red, their chests heave mightily, they sputter angry words. The degree of their indignation is astonishing. Their resolve is frightening. - Yann Martel, Life of Pi