IPA: /ˈfloʊtiəst/
KK: /ˈfloʊtiɪst/
The most light and airy, able to float easily in the air or on water.
The floatiest balloon drifted high into the sky, making everyone smile.
Comparative: floatier
Superlative: floatiest
Floatiest → It is formed from "float" (from Old English *flōtan*, meaning to flow or move lightly) and the suffix "-iest" (meaning most). The word "floatiest" describes something that is the most capable of floating or moving lightly on a surface.
Think of something that is the 'most' able to 'flow' lightly — that's why 'floatiest' means the most capable of floating.