I. sub ‧ ver ‧ sive 1 /səbˈvɜːsɪv $ -ˈvɜːr-/ BrE AmE adjective
subversive ideas, activities etc are secret and intended to damage or destroy a government or an established system:
He was engaged in subversive activities.
subversive propaganda/literature
—subversively adverb
II. subversive 2 BrE AmE noun [countable]
someone who secretly tries to damage or destroy the government or an established system:
a known subversive
—subversiveness noun [uncountable]