We are justified in assuming that this megalomania is essentially of an infantile nature and that, as development proceeds, it is sacrificed to social considerations.
en.wikipedia.org It soon becomes clear that the good captain is a bit unhinged and tending towards megalomania.
en.wikipedia.org Likewise, feelings of omnipotence or other delusions of grandeur would be considered mood-incongruent symptoms in the case of depression, while they would be mood-congruent in a person experiencing megalomania.
en.wikipedia.org Some of his contemporaries said he was frivolous, mercurial, mundane, uneducated, vindictive, a mythomaniac and, above all, terribly vain and narcissistic to the point of megalomania.
en.wikipedia.org