American Heritage Dictionary
(3)
Century Dictionary
(3)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
Insidious has been looked up 1049 times, favorited 3 times, listed 68 times, and commented on 0 times.

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a month.
Recent Lookupsshove · horse-flesh · dominate · apropos · Capitalism |
Recent Favoritesdoxastic · bissextile day · airship · cloud-shadows · ombrophobous |
Recent Pronunciationsmilosrdenstvi · lichen-covered · futon · sagacity · monoragngocious |