Added 9 October 2026 steepness noun Categories: Describing WordsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about steepness at Wordnik → Where our words come from → The property possessed by a slope that is very steep. Related Words: precipitousnessabruptnessslopingslopegradientinclinetiltslantinclinationtiltingtightnessstiffness Back to today's word