Definition of “delirious” - English Dictionary

“delirious” in British English

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deliriousadjective

uk /dɪˈlɪr.i.əs/ us /dɪˈlɪr.i.əs/
deliriously
adverb uk /dɪˈlɪr.i.əs.li/ us /dɪˈlɪr.i.əs.li/

Kate and Peter are deliriously happy (= extremely happy) together.

(Definition of “delirious” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“delirious” in American English

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deliriousadjective

us /dɪˈlɪər·i·əs/

thinking or speaking in a way that is not reasonable because of mental confusion:

He grew feverish and then delirious.

Delirious also means extremely happy:

delirious with joy

(Definition of “delirious” from the Cambridge Academic Content Dictionary © Cambridge University Press)