deadest

No longer living.

“All of my grandparents are dead.”

Figuratively, not alive; lacking life.

(of another person) So hated that they are absolutely ignored.

“He is dead to me.”

Doomed; marked for death (literally or as a hyperbole).

“"You come back here this instant! Oh, you're dead, mister!"”

Without emotion.

“She stood with dead face and limp arms, unresponsive to my plea.”

Stationary; static.

“a dead lift”

Without interest to one of the senses; dull; flat.

“a dead glass of soda.”

Unproductive.

“dead fields”

(of a machine, device, or electrical circuit) Completely inactive; currently without power; without a signal.

“Now that the motor's dead you can reach in and extract the spark plugs.”

(of a battery) Unable to emit power, being discharged (flat) or faulty.

Broken or inoperable.

“That monitor is dead; don’t bother hooking it up.”

No longer used or required.

“Is this beer glass dead?”

Not imparting motion or power by design.

“A dead axle, also called a lazy axle, is not part of the drivetrain, but is instead free-rotating.”

Not in play.

“Once the ball crosses the foul line, it's dead.”

(of a golf ball) Lying so near the hole that the player is certain to hole it in the next stroke.

(1800s) Tagged out.

Full and complete.

“dead giveaway”

Exact.

“a dead eye”

Experiencing pins and needles (paresthesia).

“After sitting on my hands for a while, my arms became dead.”

Constructed so as not to transmit sound; soundless.

“a dead floor”

Bringing death; deadly.

Cut off from the rights of a citizen; deprived of the power of enjoying the rights of property.

“A person who is banished or who becomes a monk is civilly dead.”

(often with "to") Indifferent to, no longer subject to or ruled by (sin, guilt, pleasure, etc).