a firm grasp.
a potent cup of tea.
a potent toxin.
a secure telephone connection.
a solid foundation.
a stiff drink.
a strong man.
a strong odor of burning rubber.
a strong radio signal.
a warm trail.
an impregnable fortress.
fortifications that made the frontier inviolable.
gave a strong pull on the rope.
hard liquor.
potent liquor.
providing the ground soldier with increasingly potent weapons.
several substantial timber buildings.
strong medicine.
the scent is warm.
`sing' is a strong verb.