5 “Infeasibility” is usually a noun and “unfeasible”, as nan gray notes, is undoubtedly an adjective herisson KeldericKelderic 47211 gold badge44 silver badges88 bronze badges 10 You need to present evidence. Long ago, considered one of my lecturers advocated "none is", so I exploit that (besides sometimes I do not). https://non-lethal-shells88775.nizarblog.com/38066987/the-best-side-of-cheapest-ammo-calibers-2022