The Oxford Thesaurus An A-Z Dictionary of Synonyms - randomadj.

1) haphazard, chance, fortuitous, serendipitous, aleatory, arbitrary, casual, stray, occasional, indefinite, indiscriminate, non-specific, unspecific, unspecified, unordered, unorganized, undirected, unpremeditated, unplanned, accidental, uncalculated, unsystematic, adventitious, incidental, hit-or-miss: He used a computer program to generate random numbers. A random selection of slips was drawn from the drum and Madelaine's name was on one of them. 2) at random. randomly, haphazardly, fortuitously, by chance, serendipitously, arbitrarily, casually, occasionally, (every) now and then, (every) once in a while, irregularly, indefinitely, erratically, indiscriminately, unsystematically, adventitiously, incidentally, unpremeditatedly: They picked names from a hat at random. They drove up and down the road, firing at random.