serendipitous (adjective) casual: chance, random
Detalii: casual means suited for everyday use, informal or occurring by chance - while causal means involving or constituting a cause
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