underneath underneath /ˌəndɝˈniːθ/

adverb

1. Under or below an object or a surface; at a lower place or level; directly beneath  ( underneath )
   under or below an object or a surface; at a lower place or level; directly beneath
    We could see the original painting underneath
   we could see the original painting underneath
    A house with a good foundation underneath
   a house with a good foundation underneath
   
2. On the lower or downward side; on the underside of  ( underneath )
   on the lower or downward side; on the underside of
    A chest of drawers all scratched underneath
   a chest of drawers all scratched underneath
   

preposition

1. () At a position directly lower than (with the subject just above)  ( neath [Archaic] , below , beneath , under , underneath )
   at a position directly lower than (with the subject just above)