SYN: Apprehension, fright, fear, timidity, consternation, tocsin, war-cry, war-note, reveille, dread, affright, disquietude, dismay.
ANT: Confidence, security, quiet.
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KEY: Alarm \v.\
SYN: Warn, wake, terrify, intimidate, frighten.
ANT: Compose, embolden, reassure, rally.
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KEY: Alarming.
SYN: Terrible, fearful, frightful, portentous, ominous, threatening.
ANT: Soothing, assuring, encouraging, inviting, propitious, hopeful, alluring, enticing, attractive.