Added 10 October 2026 steep-sided adjective Categories: Describing WordsObscure Words adjective ! Definition from WordNet 3.1, Princeton University. More about steep-sided at Wordnik → Where our words come from → Having very steep sides. Related Words: steepnesssteepishsteepenedsteeplysteepeststeepenclifflikeslopingcliffsidemountainousmountainy Back to today's word