I₁N₁F₄R₁A₁S₁O₁U₁N₁D₂

14 points

INFRASOUND is validvalid

sound waves too low-pitched for humans to hear [n INFRASOUNDS]

130,964 of 196,601 in NWL2023·also valid in CSW24

frequencies below the usual audible limit [n -S]

120,353 of 280,887 in CSW24·also valid in NWL2023