- Learn English
-
Learn grammar
-
List of words
-
Study your cards
-
Hang On, Man!
-
Audio Books
-
More apps
- Recent searches
-
34th
-
8 may 1945
-
cause
-
plate armor
-
heretofore
-
barrel
-
manchu
-
right
-
plumb bob
-
storey
- 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