Front

Continuous low dull humming sound

Back

Drone

Front

Extreme in degree, strength or size

Back

intense

Front

Secured or bound, struck a blow, verbal attack

Back

lashed

Front

Able to operate on land or water

Back

Amphibious

Front

Making a sharp contortion of the face

Back

grimacing

Front

Heard or able to be heard

Back

Audible

Front

stiff: not flexible

Back

rigid

Front

Affecting a large area of bodily tissue

Back

Massive

Front

Instability in the atmosphere

Back

turbulence

Front

Surviving trace; something left over

Back

remnants