Shallow

1. The rudd.
2. To make shallow.
3. Not intellectually deep; not profound; not penetrating deeply; simple; not wise or knowing; ignorant; superficial; as, a shallow mind; shallow learning.
4. A place in a body of water where the water is not deep; a shoal; a flat; a shelf.
5. Not deep; having little depth; shoal.
6. Not deep in tone.
7. To become shallow, as water.