systematically Antonyms

unsystematically not regularly episodically cold turkey by fits and starts illogically amok on occasion now and then now and again from time to time at times every once in a while every so often exponentially not always on occasions on the odd occasion in some cases hardly ever every now and then unscientifically off and on out of the blue in fits and starts indiscriminately haphazardly every which way pell-mell occasionally irregularly intuitively inconsistently desultorily cursorily chaotically arbitrarily anywise accidentally periodically promptly at random all of a sudden aimlessly unexpectedly at once swiftly sporadically sometimes randomly