1. Being in a tense state
   - edgy, high-strung, highly strung, jittery, jumpy, nervy, overstrung, restive

See also: tense

Encyclopedia: Uptight

• os nasale
• os palatinum
• os pisiforme
• os pubis
• os scaphoideum
• os sesamoideum
• os sphenoidale
• os tarsi fibulare
• os temporale
• os trapezium
• os trapezoideum
• os triquetrum
• os zygomaticum
• Osage
• osage orange
• Osage River
• Osaka
• Osaka Bay
• Osama bin Laden
• Osasco
• Osborne
• Oscan
• Oscan-speaking
• Oscar
• Oscar Fingal O'Flahertie Wills Wilde