adj. 25B6; adjective
a poisonous snake : VENOMOUS, deadly.
a poisonous chemical : TOXIC, noxious, deadly, fatal, lethal, mortal, death-dealing.
a poisonous glance : MALICIOUS, malevolent, hostile, vicious, spiteful, bitter, venomous, vindictive, vitriolic, rancorous, malign, pernicious, mean, nasty; informal bitchy, catty.
harmless, non-toxic, benevolent.