In the book "SLICED" by Bill Reynolds & Negrita Jayde, the states of muscularity are objectified as follows: "House" >= 20% - No visible muscle definition, and only a hint of separation between major muscle groups, if those groups are very large. Basically a person in this state could be confused for a football lineman. If you're higher than this bodyfat percentage, you'd be considered overweight/obese.
"Hard" >= 15% - Some muscle separation appears between delts and upper arm. Abs are still not visible
"Cut" - >= 12% - More muscle separation appears particularly in the chest and back, outline of the abs begins to appear slightly.
"Defined" >= 10% - Muscle separations get deeper in the arms, chest, legs and back, and abs appear when flexed.
"Ripped" >= 7-9% - Abs are clearly visible all the time, vascularity in arms is prominent, chest and back separation is obvious, and face is starting to appear more angular. Condition can be held indefinitely.
"Shredded" >=5-7% - Striations appear in large muscle groups when flexed. Vascularity appears in lower abdomen and in the legs. Condition can be held for several days with careful dieting. Competitive bodybuilders often aim for this state for competition day.
"Sliced" <= 3% - Muscles and tendons begin to appear in the face. Muscle striations and vascularity highly visible. Subcutaneous water levels are near 0. Condition can only be held for a few hours at a time. Not a healthy condition to stay in due to lower water level. Note - The male body requires 3% body fat for normal bodily function, women require 12%.