Noun
The quality of being mighty; possession of might; power; greatness; high dignity.
Highness; excellency; -- with a possessive pronoun, a title of dignity; as, their high mightinesses.
Source: Webster's dictionaryI learn the depth to which I have sunk from the length of the chain let down to up-draw me. I ascertain the mightiness of the ruin by examining the machinery for restoration. Henry Melvill