alarmist

noun

1. a person who tends to raise alarms, especially without sufficient reason, as by exaggerating dangers or prophesying calamities.

adjective

2. of or like an alarmist.

noun

1. a person who alarms or attempts to alarm others needlessly or without due grounds
2. a person who is easily alarmed

adjective

3. characteristic of an alarmist

n.

“one addicted to sounding alarms,” 1793, from alarm (n.) + -ist.