- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
panhandler
-
trafficking
-
active trust
-
aerial
-
spouse
-
fastidious
-
errand
-
adam's peak
-
sale
-
gimp
- Hide translation
insidiously
insidiously /ɪnˈsɪdiəsli/
adverb
-
(
)
In a harmfully insidious manner
(
perniciously
, insidiously
)
in a harmfully insidious manner
These drugs act insidiously
these drugs act insidiously