causelessly   
fotsiny
alone, exclusive of anything else, for nothing, insignificantly, causelessly. See foana, hiany, maina. [Richardson 1885]
tsy ahoan-tsy ahoana
(tsy ahoana tsy ahoana) causelessly, without reason [Richardson 1885]
tsy misy antony
without object, causelessly. [Richardson 1885]