insidiosum

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insidios.um          ADJ    1 1 NOM S N POS             
insidios.um          ADJ    1 1 VOC S N POS             
insidios.um          ADJ    1 1 ACC S M POS             
insidios.um          ADJ    1 1 ACC S N POS             
insidiosus, insidiosa -um, insidiosior -or -us, insidiosissimus -a -um  ADJ   [XXXCO]  
treacherously; deceitfully; cunningly; stealthily; insidiously;