nervousness, jitters, uneasiness, weakness, sluggishness, jitteriness, tentativeness, inconsistency, unsteadiness, skittishness, hesitancy, discomfort, listlessness, timidness, jumpiness, troubles, fragility, rustiness, tightness, hesitance, unease, inexperience, frailty, wobble, sloppiness, woes, rockiness, unevenness, hiccup, slippage, lethargy, letdown, queasiness, indecisiveness, nerves, anxiousness, apprehensiveness, immaturity, headaches, fallibility, lapses, cautiousness, malaise, anxiety, fuzziness, indigestion, growing pains, softness, tiredness, blurriness, problems, ineffectiveness, tenuousness, turbulence, fogginess, wariness, shortcomings, deteriorations, stuttering, nagging, weaknesses, bumpiness, reluctance, edginess, dovishness, turmoil, cramping, fractiousness, meltdowns, fatigue, looseness, missteps, choppiness, reticence, gaffes, worries, wooziness, struggles, irritation, overexcitement, aggressiveness, indecision, ructions, diffidence, difficulties, weakening, restlessness, unreadiness, lack, testiness, unfamiliarity, stage fright, bashfulness, setbacks, blips, numbness, brittleness, slackening, lousiness, poise, disarray, brillance, unsoundness, compulsion, confusion, insecurity, awkwardness, buoyancy, chaos, clumsiness, coldness, demoralization, desperation, destitution, dif, disadvantage, disharmony

tremolo

albuterol, alupent, metaproterenol, proventil, ventolin

instability, motion, unstableness

palpitation, quiver, quivering, ricketiness, shaking, trembling, tremor, vibration