DEEPNESS is a term that can be used to describe a variety of concepts. PROFUNDITY, which has 10 letters, is a synonym for deepness and refers to something that is intellectually or spiritually profound. INTENSITY, with 9 letters, is another word for deepness and implies a high degree of strength or force. ABYSS, with 5 letters, is a deep chasm or void, often referring to a seemingly bottomless pit. DROP, with 4 letters, is a small amount of liquid, but it can also refer to a steep descent or decline. Lastly, DEPTH, with 5 letters, is the measure of how far something goes down, such as the DEPTH of a lake or ocean. All of these words are related to the concept of deepness in some way.