How Do You Spell MATTIEST?
Pronunciation: [mˈatɪəst] (IPA) 
The word "mattiest" is spelled as /ˈmætiɪst/. It is derived from the adjective "mat" which means flat and dull. The suffix "-iest" is added to the end of the word to indicate the superlative form, meaning the most flat and dull. This spelling follows the typical English spelling pattern for adding the superlative suffix "-iest" to a word ending in a consonant sound. Though "mattest" is also acceptable, "mattiest" is often preferred in modern English.
