ǒu​rán HSK5

accidental

偶然 ǒu​rán
accidental adjective
happening by chance or unexpectedly; fortuitous

We bumped into each other on the street by chance.

occasional adjective
happening from time to time; not regularly

He usually doesn't drink at all, but occasionally has a bit during festivals.

Frequency

Movie subtitles
12.1 per million appears in 5% of films
Written text
17.1 per million

Details

HSK 2.0
Level 5
HSK 3.0
Level 5

Sources

Definitions
CC-CEDICT