Preposition: in

• onset: The condition may be insidious in onset, caused by infection, infarction or insufficient insulin.

Modifies a noun

• onset: Some patients, however, present with a more insidious onset.

• threat: There is a more insidious threats to Gulf stability.

• plot: This is an insidious plot to stop you getting involved with the electric mania in which you wire up hundreds of lightbulbs.

• danger: A more insidious danger is horizontal gene transfer - the transfer of genetic material directly to unrelated species.

• influence: Too many scientists are becoming modern peddlers of snake oil under the insidious influence of the corporate culture.

• nature: The insidious nature of the EU is such that the majority of British citizens do not even recognize the threat.

Modifying Another Word

• particularly: I think it is a particularly insidious form of plagiarism.

• so: So insidious in people's minds, so full of surprises.

• very: I know we are working against an enemy who is very insidious in his methods.

• often: Its onset is often insidious, leading to delays in diagnosis.

• especially: Few people see any real difference between the various forms of PC pest, but Trojans are an especially insidious bunch.

• usually: The disease pattern is usually insidious with peripheral mono- or oligoarthritis.

Used with adjective complement

• become: Footnotes [ 1 ] Increasingly the spam is becoming more insidious.