Without advance planning
English: by chance, accidentally, circumstantially, unexpectedly
Bahasa: kebetulan
by chance, accidentally, by luck, circumstantially, haply
English: by chance, accidentally, circumstantially, unexpectedly
Bahasa: kebetulan
English: haply, by chance, by luck
Bahasa: kebetulan
English: perchance, by chance
Bahasa: kebetulan