Antonyms of adj jittery

1 of 2 senses of jittery

Sense 2
edgy, high-strung, highly strung, jittery, jumpy, nervy, overstrung, restive, uptight -- (being in a tense state)

INDIRECT (VIA tense) -> relaxed -- (without strain or anxiety; "gave the impression of being quite relaxed"; "a relaxed and informal discussion")

Similarity of adj jittery

2 senses of jittery

Sense 1
jittery -- (characterized by jerky movements; "a jittery ride")

Sense 2
edgy, high-strung, highly strung, jittery, jumpy, nervy, overstrung, restive, uptight -- (being in a tense state)
       => tense (vs. relaxed) -- (in or of a state of physical or nervous tension)

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