tremulous (adj.)

• afraid
• agitated
• aguish
• anxious
• bashful
• blurred
• choked
• cowardly
• diffident
• doubtful
• faltering
• fearful
• fearing
• fearsome
• fidgety
• frightened
• goosy
• guttural
• harsh
• hawking
• hesitant
• hoarse
• inarticulate
• indistinct
• jittery
• jumpy
• mousy
• muzzy
• nasal
• nervous
• palpitating
• palsied
• quavering
• scared
• scary
• shaking
• shaky
• shivering
• shivery
• shrinking
• shuddering
• shy
• skittish
• snuffling
• stifled
• strangled
• thick
• throaty
• timid
• timorous
• trembling
• trigger-happy
• unsteady
• unsure
• velar
• wavering
• wobbly
• worried