Covered with frost is a term used to describe a surface that has been covered in a layer of ice crystals due to cold temperatures. This phenomenon can be described using three words: rimed (5 letters), RIMY (4 letters), and ICY (3 letters). Rimed is an adjective that means covered with a white or grayish-white deposit of frozen water vapor. RIMY is an adjective that means covered with hoarfrost, which is a type of frost that forms when the air is humid and the temperature is below freezing. Lastly, ICY is an adjective that means covered with a layer of ice.