Word: deadest
No longer living. Example: All of my grandparents are dead.
Figuratively, not alive; lacking life.
(of another person) So hated that they are absolutely ignored. Example: He is dead to me.
Doomed; marked for death (literally or as a hyperbole). Example: "You come back here this instant! Oh, you're dead, mister!"
Without emotion. Example: She stood with dead face and limp arms, unresponsive to my plea.
Stationary; static. Example: a dead lift
Without interest to one of the senses; dull; flat. Example: a dead glass of soda.
Unproductive. Example: dead fields
(of a machine, device, or electrical circuit) Completely inactive; currently without power; without a signal. Example: 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. Example: That monitor is dead; don’t bother hooking it up.
No longer used or required. Example: Is this beer glass dead?
Not imparting motion or power by design. Example: A dead axle, also called a lazy axle, is not part of the drivetrain, but is instead free-rotating.
Not in play. Example: 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. Example: dead giveaway
Exact. Example: a dead eye
Experiencing pins and needles (paresthesia). Example: After sitting on my hands for a while, my arms became dead.
Constructed so as not to transmit sound; soundless. Example: a dead floor
Bringing death; deadly.
Cut off from the rights of a citizen; deprived of the power of enjoying the rights of property. Example: 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).
You can find a list of possible crossword clues for DEADEST below.