The intense and obsessive desire to possess something, especially something that belongs to someone else.
From Old French coveitise, Latin cupiditas, with the -ness suffix added to covetous to form an abstract noun describing the quality or state of being covetous.
Ancient philosophers warned that covetousness is a bottomless pit—the more you get, the more you want, which is why rich people aren't necessarily happier than middle-class people!
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