adjective

having or involving a sensation of spinning around and losing one’s balance.

Jonathan had begun to suffer dizzy spells

giddy,light-headed,faint,weak,weak at the knees,unsteady,shaky,wobbly,off-balance,reeling,staggering,tottering,teetering,woozy,with legs like jelly,with rubbery legs,vertiginous,dazed,confused,muddled,befuddled,bewildered,disoriented,disorientated,stupefied,groggy,muzzy,dopey,woolly,woolly-headed,not with it,discombobulated