| insidiou | In junior high and high schools, they say insidious forms of bullying are on the rise. |
| insidious | (adj) beguiling but harmful, Example: insidious pleasures |
| insidious | (adj) intended to entrap |
| insidious | (adj) working or spreading in a hidden and usually injurious way, Syn. subtle, pernicious, Example: glaucoma is an insidious disease; a subtle poison |
| insidiously | (adv) in a harmfully insidious manner, Syn. perniciously, Example: these drugs act insidiously |
| insidiousness | (n) subtle and cumulative harmfulness (especially of a disease) |
| insidiousness | (n) the quality of being designed to entrap |
| Insidious | a. [ L. insidiosus, fr. insidiae an ambush, fr. insidere to sit in; pref. in- + sedere to sit: cf. F. insidieux. See Sit. ] [ 1913 Webster ] The insidious whisper of the bad angel. Hawthorne. [ 1913 Webster ]
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| insidiousness | n. A subtle and cumulative harmfulness, especially of a disease. [ WordNet 1.5 ] |