Deep and Longish

Deep adjective - Extending far downward.

Longish and deep are semantically related In some cases you can use "Longish" instead an adjective "Deep".

Nearby Words: deeply, deepen, deepness, deepened, deepening

Longish adjective - Somewhat long.

Deep and longish are semantically related in long topic. You can use "Deep" instead an adjective "Longish", if it concerns topics such as extended in space or time.