(adv.) By experiment; by experience or trial.

airily any old way any which way anyhow at haphazard at intervals at random bunglingly by chance by fits by snatches capriciously carelessly casually clumsily cursorily desultorily disregardfully erratically experimentally fitfully forgetfully haphazardly heedlessly helter-skelter hit and miss in snatches in spots inattentively inconsiderately indiscriminately irregularly messily offhand offhandedly once over lightly perfunctorily promiscuously randomly recklessly regardlessly slapdash sloppily spasmodically sporadically tactlessly thoughtlessly unguardedly unheedfully unheedingly unmethodically unmindfully unsolicitously unsystematically unthinkingly unvigilantly unwarily