The word is in the Wiktionary

9 short excerpts of Wiktionnary (A collaborative project to produce a free-content dictionary.)

— English words —

• insidious adj. Producing harm in a stealthy, often gradual, manner.
• insidious adj. Intending to entrap; alluring but harmful.
• insidious adj. (Nonstandard) Treacherous.

— English word, defined in German —

• insidious Adj. Plan: heimtückisch, hinterhältig; direkt Feind: gefährlich; subtil Krankheit: schleichend.

— English word, defined in French —

• insidious adj. Insidieux.

— English words, defined in Spanish —

• insidious adj. Insidioso.
• insidious adj. Artero.
• insidious adj. Traicionero.
• insidious adj. Pérfido.

13 English words from 3 English definitions

alluring but entrap gradual harm harmful Intending manner Nonstandard often Producing stealthy Treacherous

2 English words from 6 foreign definitions

Plan subtil

12 foreign words from 6 foreign definitions

Artero direkt Feind gefährlich heimtückisch hinterhältig Insidieux Insidioso Krankheit Pérfido schleichend Traicionero

3 suffixes (New words found by adding one or more letters at the end of the word.)

insidiously insidiousness insidiousnesses

One prefix (New word found by adding one or more letters in front of the word.)

uninsidious

18 words-in-word (Words found as is inside the word. Minimum size 3 letters.)

DIO idio- ins Ins INS in's ins. Ins. IOU IOUs -ious NSI ous -ous sid Sid SID sid'

9 words-in-word RTL (Words found written from right to left, inside the word. Minimum size 3 letters.)

dis dIs Dis DIs DIS 'dis dis- OID -oid

One anagram found with an extra letter (New word formed with all the letters from the word and an extra letter.)

louisinids

One anagram found minus a letter (New word formed with all the letters from the word minus a letter.)

sinusoid

3 cousins (New words found by changing only one letter.)

incidious insiduous invidious

Recommended websites

• Visit 1Word.ws - the word is a valid scrabble word (10 points).
• Visit www.BestWordClub.com - to play scrabble duplicate online.

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