making it up as one goes along (verb) play it by ear: take a situation as it comes
Sinonime: capricious,
changeable,
crazy, empty-headed,
fatuous, feather-brained,
fickle,
foolish, frivolous, giddy, harebrained, heady, inane, light-headed, silly, skittish,
unstableAntonime: clear-thinking, sensible, smart