dirty is the most common antonym, squalid is correct, but it is a more extreme description.
The word "squalid" is used to describe a place that is extremely dirty and disgusting. An example of a sentence that uses the word would be: Being in that squalid apartment made her skin crawl.
Harry was shocked to see the squalid conditions in which some people had to live when visiting a large developing world city.
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".