insidiosior

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insidiosi.or         ADJ    1 1 NOM S C COMP            
insidiosi.or         ADJ    1 1 VOC S C COMP            
insidiosus, insidiosa -um, insidiosior -or -us, insidiosissimus -a -um  ADJ   [XXXCO]  
treacherously; deceitfully; cunningly; stealthily; insidiously;