You searched English word "Fastness" meaning in French that is "solidité". Fastness is a Noun. We Spell Fastness as [fast-nis, Fahst-]. Fastness meaning in French has been searched 1757 ( one thousand seven hundred fifty seven ) times till today 24/09/2026. Get translation of the word Fastness in Urdu and Roman Urdu. Learn how to speak Fastness Word in French and English. You may also find the meaning of Word Fastness in English to French, Urdu, Arabic, Spanish, German, Hindi and other languages.