egomaniacal

As adjectives the difference between egomaniacal and undefined

is that egomaniacal is having the psychological condition of egomania while undefined is lacking a definition or value.

As an adjective egomaniacal

is having the psychological condition of egomania.

As a noun egomaniac is

a person obsessed with their own (supposed) importance.

is likely misspelled.

has no English definition.

As an adjective egomaniacal

is having the psychological condition of egomania.

As adjectives the difference between egotistical and egomaniacal

is that egotistical is tending to talk excessively about oneself while egomaniacal is having the psychological condition of egomania.