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âº (of something unpleasant or dangerous) gradually and secretly causing harm: High blood pressure is an insidious condition which has few symptoms. Thesaurus: synonyms and related words. Dangerous and harmful. adverse.
Learner's definition of POMPOUS. [more pompous; most pompous] disapproving. : having or showing the attitude of people who speak and behave in a very formal and serious way because they believe that they are better, smarter, or more important than other people. a pompous [=self-important] politician. a pompous remark.