acts with decorum (verb) behave: act reasonably, properly
Sinonime: accidental, adventitious, by chance, contingent,
erratic,
extemporaneous, extempore, fluky, fortuitous,
impromptu, improvised,
impulsive, incidental, infrequent,
irregular,
occasional,
odd, offhand, serendipitous,
spontaneous,
uncertain, unexpected, unforeseen, unintentional, unplanned, unpremeditated
Antonime: deliberate,
painstaking, planned, premeditated