fortuitously is a form of:

Fortuitous



adjective
1.
(happening by chance., accidental) ដោយជួន
ENGLISH MEANING
adjective
1.
Happening by chance; coming or occuring unexpectedly, or without any known cause; chance; as, the fortuitous concourse of atoms.
2.
Happening independently of human will or means of foresight; resulting from unavoidable physical causes.