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fulminate
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old-fashioned
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gauntlet
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adlumia
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doubling
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mephitis macroura
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insidiously
insidiously /ɪnˈsɪdiəsli/
adverb
-
(
)
In a harmfully insidious manner
(
perniciously
, insidiously
)
in a harmfully insidious manner
These drugs act insidiously
these drugs act insidiously