Imperceptibly Insidious means undetectably harmful or dangerous. Something that is imperceptible is not detectable by a sense or by the mind. Insidious comes from a word that means ambush – a sudden unexpected attack. Something insidious is gradual undetectable and subtle leading to a harmful or dangerous outcome. It is like someone or something removing something very valuable (money, company, spouse, family, position, health, influence) from you without your knowledge or consent until it is all gone. When you need it, it is no longer there. Paul issues a warning to Christians to be aware of certain insidious people and I would include things. Insidious people or things will slowly remove and erode our faith. The faith we think we have will becomes worthless. Because imperceptibly Insidious persons and things remove holiness, commitment, prayer and strip mercy, compassion, forgiveness, discretion, contemplation from the believer’s life until that life has become similar in nearly every respect to that of an unbelievers.