Added 10 October 2026 overcastness noun noun ! Definition from Wiktionary (CC BY-SA). More about overcastness at Wordnik → Where our words come from → The quality of the weather being overcast. Origin From overcast + -ness. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: cloudinessuncloudednessdowncastnessstorminessmistinesscloudageobscurationobscurenessstormfulnessweatherproofnessoverheatedness Back to today's word