verb

make (someone) agitated or confused.

there’s nothing you can do or say to fluster Bernie

unsettle,make nervous,unnerve,agitate,ruffle,upset,bother,put on edge,discompose,disquiet,disturb,worry,alarm,panic,perturb,disconcert,confuse,throw off balance,confound,nonplus,hassle,rattle,faze,discombobulate,put into a flap,throw into a tizz,send into a spin

noun

an agitated or confused state.

the main thing is not to get all in a fluster

state of agitation,state of anxiety,nervous state,flutter,panic,frenzy,fever,fret,upset,turmoil,commotion,dither,flap,tizz,tizzy,tiz-woz,twitter,state,sweat,stew,twit