I₁N₁S₁I₁D₂I₁O₁U₁S₁L₁Y₄

15 points

INSIDIOUSLY is validvalid

in an insidious manner [adv]

153,338 of 196,601 in NWL2023·also valid in CSW24

INSIDIOUS, developing or advancing gradually and imperceptibly [adv]

121,415 of 280,887 in CSW24·also valid in NWL2023