ague, bumpiness, caring, ceaselessness, chattering, chord, chorea, cold shivers, concern, constancy, constant flow, continualness, continuity, echo, empathy, fellow feeling, fits and starts, fluctuation, frequency, frequency band, frequency spectrum, harmonic motion, identification, incessancy, involvement, jactation, jactitation, jerkiness, joltiness, libration, noninterruption, nutation, oscillation, palsy, pathos, pendulation, periodicity, perpetuity, pulsation, quaking, quavering, quick fire, quivering, rapid fire, rapid recurrence, rapid succession, rapidity, regularity, relating, repetition, resonance, resonance frequency, response, responsiveness, shakes, shaking, sharing, shivering, shivers, shuddering, spasms, staccato, steadiness, stuttering, succussion, sustainment, sympathetic chord, sympathetic response, sympathy, tattoo, trembling, tremulousness, unintermission, uninterruption, vacillation, vibes, vibrancy, vibratility, vibrations, wavering