Jitter

Part of speech: noun, verb

Pronunciation: /ˈd͡ʒɪtə(ɹ)/

Definitions

1. A condition marked by rapid, unsteady movements often linked to anxiety or excitement
2. A phenomenon involving quick, slight shakes that usually indicates nervousness or emotional instability
3. A small rapid trembling movement commonly observable in hands or equipment ; a state of nervous agitation characterized by unease or tension

Etymology: The verb "jitter" is probably an alteration of "chitter," meaning to tremble or shiver, which in turn traces back to Middle English "chittern," meaning to twitter or chatter. The word is ultimately onomatopoeic, built to imitate the rapid, trembling sound and motion it describes. German "zittern," meaning to tremble, is a close relative, and English "didder" and "teeter" share the same rattling quality. Its modern sense of jittery nerves came later and is tied to a shift in the noun. The noun form appears to have developed from the verb, and it is now used for the quick, slight shakes that signal nervousness or emotional instability. The "-er" ending is a suffix, and the form "jit" is a simple base. The word "jitter" is therefore the product of the verb ending in English, not a separate older root, which is why it sounds so much like its sound-imitating relatives.

Synonyms: nervousness, anxiety, twitch, quiver, shiver

Antonyms: calm, serenity, tranquility, peace, composure