trepidation (n.)
- agitation
- alarm
- apprehensiveness
- bluster
- boil
- boiling
- brouhaha
- bustle
- churn
- commotion
- consternation
- creeps
- discomposure
- dismay
- disorder
- disquiet
- disquietude
- disturbance
- dread
- ebullition
- embroilment
- excitement
- fear
- ferment
- fermentation
- fever
- feverishness
- fidgetiness
- flap
- flurry
- fluster
- flutter
- fright
- fume
- fuss
- gooseflesh
- heaving
- horripilation
- horror
- hubbub
- inquietude
- jitters
- jumpiness
- maelstrom
- malaise
- moil
- nerves
- nervousness
- palpitation
- panic
- panting
- perturbation
- pitter-patter
- quaver
- quiver
- quivering
- restlessness
- roil
- rout
- row
- shaking
- shiver
- shudder
- stir
- sweat
- swirl
- terror
- throb
- throbbing
- tic
- to-do
- tremble
- trembling
- tremor
- trepidity
- tumult
- turbidity
- turbulence
- turmoil
- twitching
- unease
- uneasiness
- unrest
- upset
- vellication
