Just use it like this,

Nicko felt slighted at school because he was alone at lunch.

Liliana was slighted because she had done a stunt which led her to suspension.

Basically it has to be used in a sentence that is upset. When you feel slighted, you feel left out or looked down upon.

Ercked: to feel insulted, slighted, put off. (Incidentally, it's spelled "irked".)

yes, it should not be slighted

slighted, disregarded

The psychology of a person who is a "gangster " is one usually a social path or a psychopath. They don't feel guilty for the things they do and part of this is a egotistical personality who feels slighted if they are ignored.