Insidious

Insidious
adj.- Deceitful, false; Fradulent, sharp, guileful, slick, slippers, shifty, tricky, underhanded, furtive, surreptitious, falsehearted.
deceitful, cunning, dishonest, shrewd.

unscrupulous, unprincipled, unethical, immoral, amoral; corrupt,
questionable, indirect, slippery, devious.

operating or prodeeding inconspicuously but with grave effect.

Insidious intent.
Insidious agenda.
Insidious thoughts.

Too much of it abounds.

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The insidious intent of the committee invaded the otherwise immutable inclination of the mindset of the mob, absorbed in thought, whilst questionable motives undermined admirable judgement. The resulting explosion was disasterous.