Choose the perfect synonym or antonym for the word

Panic

/ˈpænɪk /

A strong, sudden feeling of fear that causes a person to act quickly, often without thinking.

Synonyms:

But they were all panicking.

Everybody panics easily these days.

Strangely enough, she felt no panic.

From Greek panikos, pertaining to Pan, the god associated with sudden fear; emerged in late 16th century from the Latin panicus.

15 mentions per 1 million words

Moderate

Hint: Frequency according to COCA