1. Characterized by jerky movements
   "a jittery ride" 
2. Being in a tense state
   - edgy, high-strung, highly strung, jumpy, nervy, overstrung, restive, uptight

See also: jitter, jitteriness, tense

• undeterred
• undeveloped
• undeviating
• undiagnosable
• undiagnosed
• undies
• undifferentiated
• undigested
• undignified
• undiluted
• undiminished
• undimmed
• undine
• undiplomatic
• undiplomatically
• undirected
• undiscerning
• undischarged
• undiscipline
• undisciplined
• undisclosed
• undiscouraged
• undiscoverable
• undiscovered
• undiscriminating