I₁M₃P₃E₁R₁T₁U₁R₁B₃A₁B₃L₁E₁

21 points

IMPERTURBABLE is validvalid

not perturbable [adj] : IMPERTURBABLY [adv]

181,103 of 196,601 in NWL2023·also valid in CSW24

marked by extreme calm, impassivity, and steadiness [adj IMPERTURBABLY]

117,484 of 280,887 in CSW24·also valid in NWL2023