That party was dead by midnight.

No longer alive or functioning; often used to describe something that is completely finished or lacking energy.
The joke was dead on arrival.
After the long meeting, everyone felt dead tired.
The conversation went dead after that awkward moment.
dead silence
dead end
dead weight
lifeless
inactive
finished
The plant is dead because it didn't get enough water.

No longer alive; having lost life.
The tree is dead after the storm.
His pet fish is dead now.
The flowers are dead from the frost.
dead body
dead end
dead silence
deceased
lifeless
inanimate