farewell or goodbye
An antonym may be disregard, shun, and ignore.
informal
No. AN antonym for deceased would be alive. An antonym for friendly would be unfriendly or hostile.
No. An antonym for answer would be unknown or mystery.
There would not be an antonym for equipment.
Elation would be an antonym.
An antonym for alert would be notify or inform.
In the sense of 'lewd', an antonym would be 'conservative' or 'puritanical'. In the sense of 'slippery', an antonym would be 'sticky'.
The antonym of prehistoric would be, modern.
An antonym is a word that has the opposite meaning. One antonym for "polite" would be "rude"; another would be "obnoxious".
"Lose" would be an antonym for "win". "Defeat" would b e an antonym for "Victory".
AN antonym for exhaustion would be energize. Another would be vitality.