I₁N₁S₁U₁R₁M₃O₁U₁N₁T₁A₁B₃L₁E₁

18 points

INSURMOUNTABLE is validvalid

not surmountable [adj] : INSURMOUNTABLY [adv]

189,246 of 196,601 in NWL2023·also valid in CSW24

incapable of being surmounted [adj INSURMOUNTABLY]

121,861 of 280,887 in CSW24·also valid in NWL2023