adjective
1.
containing nothing; not filled or occupied.
"she put down her empty cup"
synonyms: vacant, unoccupied, uninhabited, untenanted, clear, free, bare, desolate, deserted, abandoned More
2.
(of words or a gesture) lacking meaning or sincerity.
"their promises were empty words"
synonyms: meaningless, aimless, worthless, useless, idle, vain, insubstantial, ineffective, ineffectual More

verb
1.
remove all the contents of (a container).
"we empty the till at closing time"
synonyms: unload, unpack, unburden, disburden, clear, make vacant, vacate, evacuate, void; rareunlade
"he was emptying the dishwasher"
nouninformal
1.
a bottle or glass left empty of its contents.
"the barman collected the empties"