noxious - Dictionary definition and meaning for word noxious
Oxides of nitrogen are all toxic and are represented by NOx (Sulfur oxides by SOx)so NOx -IOUS...means harmful...also something NOXIOUS can make you NAUSEOUS
Noxious [Naxalites - bihar ke harmul, injurious terrorist] (Naxalites are Harmful terrorist of Bihar, India)
n(no)oxious(think as oxigen)thus no oxigen-that is very harmful..........
It is not toxic, it is NOT TOXIC
you got promoted from abnoxious to NOXIOUS after you pushed him over the cliff.