The Collaborative International Dictionary
megalomaniacal
megalomaniacal \megalomaniacal\, megalomanic \megalomanic\adj. Suffering from megalomania.
Douglas Harper's Etymology Dictionary
megalomaniacal
1884, from megalomaniac + -al (1).
Wiktionary
megalomaniacal
a. of, exhibiting, or affected with megalomania
WordNet
megalomaniacal
adj. suffering from megalomania [syn: megalomanic]
Usage examples of "megalomaniacal".
Having only just discovered the shocking news that megalomaniacal dictators do not always keep their promises, the Times again insisted that Bush rush back to the negotiating table.
Grace Rinehart was a megalomaniacal superpatriot with an Electra complex.