случайный in English:

Columbus' discovery of America was accidental.

That discovery was quite accidental.

Our meeting was purely accidental.

Their accidental meeting started a life-long friendship.

It was an accidental explosion of the fuel tank.

Our encounter was accidental.

Manner of death... accidental.

I still have our accidental meeting in my mind.

Before we met officially we had had an accidental meeting at the university.

Reports suggest that eleven soldiers were killed by accidental fire from their own side.

An accidental spillage.

The mellow sounds of the Rhodes piano are partly responsible for thousands of accidental conceptions.

His rudeness was conscious, not accidental.

In short some guns have excellent security systems to prevent accidental firing (e.g. when dropped), others don't.

He doesn't travel much apart from occasional business trips.

Tomorrow's weather should be sunny with occasional rain.

Cloudy with occasional rain.

He said he had an occasional smoke,

Except for an occasional rose, he never gave her flowers.

There are monthly films and occasional quiz nights.

Yuriko thoroughly enjoyed her occasional secret meetings with her lover.

Even superheroes need an occasional break.

I have occasional pains in the stomach.

We are expecting an occasional rainfall.

Even now there are occasional aftershocks.

Occasional showers are possible tomorrow.