casually Antonyms

at once in no time accidentally on purpose all of the sudden anticipatorily antsily asudden at a stroke at full stretch in one fell swoop before you can say Jack Robinson quick as a flash excitedly in an instant as a rule neurotically zealously vigorously by design assiduously all at once all of a sudden exclusively avidly seriously essentially laboriously like hell fervently in a jiffy in one stroke unshakably voraciously wholeheartedly worriedly in a trice like greased lightning in less than no time as fast as greased lightning in no time at all all at one time all in one go in a tick undesirably tetchily tautly lightning fast on a dime phenomenally purposefully