Added 9 October 2026 deepen /ˈdiːpən/ verb Categories: ActionsRare Words verb ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about deepen at Wordnik → Where our words come from → Make more intense, stronger, or more marked. The efforts were intensified Become more intense. The debate intensified Make deeper. They deepened the lake so that bigger pleasure boats could use it Related Words: intensifyheightenchangecompounddepthdeepintensifyingintensivebroadenwidensolidifyextend Back to today's word