alarmist
/əˈlɑrməst/
noun
Someone who is considered to be exaggerating a danger and so causing needless worry or panic.
the problem is a fabrication by alarmists
scaremonger,gloom-monger,doom-monger,voice of doom,doomster,doomsayer,doom merchant,Cassandra
adjective
Creating needless worry or panic.
alarmist rumors
gloomy,dismal,pessimistic,negative,defeatist,downbeat,gloom-ridden,cynical,bleak,grim,fatalistic,black,sombre,drab,dreary