insidious

definition: working or spreading in a hidden and usually injurious way
example: Glaucoma is an insidious disease.
speech part: adjective
synonyms: pernicious subtle
definition: intended to entrap
example:
speech part: adjective
synonyms:
definition: beguiling but harmful
example: insidious pleasures
speech part: adjective
synonyms:

insidious is explained and pronounced

How insidious is being used?