Selfishness is caring only about what suits you. Sheer selfishness, an act of selfishness, accused of selfishness.
It is a moral charge and a common one in family arguments, and the interesting thing about it is that everybody applies a different threshold — looking after your own interests is not selfishness until somebody else decides it is. Note that self plus -ish makes a disparaging word, as in childish and mannish.
1nounselfishnessCaring only about what suits you.
“His selfishness annoyed everyone; he always took the biggest piece and never shared.”
selfishness is a moral fault.
From selfish + -ness.
Etymology from Wiktionary, CC BY-SA