insidiously

1. 1.

   in a harmfully insidious manner

   “these drugs act insidiously”

   Synonymsperniciously

Questions about insidiously

What does insidiously mean?

insidiously means "in a harmfully insidious manner".

How many syllables are in insidiously?

insidiously has 5 syllables and divides as in-si-di-ou-sly under the regular spelling rules. It is not in the CMU Pronouncing Dictionary, so that comes from how the word is written rather than from a recorded pronunciation, and no stress or phonetic transcription is claimed for it.

What is another word for insidiously?

Close synonyms include perniciously. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is insidiously a common word?

insidiously is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.