FORTUITOUS

happening by accident or chance

having no cause or apparent cause

occuring by happy chance
ANT - intended

"profits were enhanced by a fortuitous drop in the cost of raw materials."

"Wayne didn't trust these so called fortuitous events, there had to be a reason for their change in fortune."

"She didn't believe in fortuitous things happening. There was a reason and cause for everything even if we, as humans are unable to see it."

"Luckily in the middle of these lowly times, they had a fortuitous visit from their rich aunt Cecilia who was able to provide them all with food and laughs until their slump subsided."

"She believed in God because whenever their fortunes would flag, strange fortuitous events would occur which would lift their spirits and wallets up."