rock-hard

Adjective

rock hard (not comparable)

1. As tough, hard, or inflexible as a piece of rock.
   • One of humankind's oldest maladies, kidney stones are rock-hard1998, Jean Carper, Food - Your Miracle Medicine, page 192

   Synonyms:

   rock solid

2. With muscles developed and toned to a high degree, especially the muscles of the abdomen.
   • He was pale but rock-hard from exercise, and still had a grunt's haircut.2007-2008, quoted in Best Newspaper Writing, 2007-2008, page 367
3. (figuratively) Having a very fully erect and stiff penis
   • Tommy Lee first shivered when he felt the tongue in his ear, but his whole body shuddered when he felt the deputy's rock hard cock press along the length of his ass crack.2008, Eden Bradley, Forbidden Fruit, page 112
4. (figuratively) With strongly held beliefs and opinions, deep conviction.
   • Mark does not seem to be suffering from any inner conflict, in that he is rock hard and will not budge from this position.2010, Richard House, Del Loewenthal, Childhood, Well-Being and Therapeutic Ethos, page 96