rigidly

Concise Oxford English Dictionary © 2008 Oxford University Press:
rigid/ˈrɪʤɪd/

▶adjective

• 1 unable to bend or be forced out of shape.

  ■ (of a person) stiff and unmoving.

• 2 not able to be changed or adapted.

▶noun a truck which is not articulated.

– derivatives
rigidify verb (rigidifies, rigidifying, rigidified),
rigidity noun,
rigidly adverb,
rigidness noun.

– origin ME: from L. rigidus, from rigere ‘be stiff’.