City Jobs. 1  Job Opportunities. 2  Human Resources. 3  Internal Opportunities. (City of Irvine Employees Only)  Teach a 1  Class. Volunteer Opportunities.  Youth Employment Services.
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.
adventitious (comparative more adventitious, superlative most adventitious) 1  From an external source; not innate or inherent, foreign. 2  Accidental, additional, appearing casually. ( 3 genetics, medicine) Not congenital; acquired. ( biology) Developing in an unusual place or from an unusual source.