Noxious is an adjective that means dangerous.

The Latin word noxa (NOKES ah) means ‘harm.’ This word has evolved into a number of English words like ‘obnoxious,’ and ‘nausea’ that refer to some form of harm. Noxious usually describes something poisonous or very unpleasant — often something of a moral nature.

For example: All those noxious ideas from my campaign manager probably caused me to lose the election. There’s no quicker way to sink in the poles than to engage in behavior that your constituency finds offensive.