C2 adjective /ˌæd.vɛnˈtɪʃ.əs/
adventitious
आकस्मिक
Meaning
Happening by chance or accident, not planned.
Example
His success was partly due to adventitious circumstances.
उसकी सफलता आंशिक रूप से आकस्मिक परिस्थितियों के कारण थी।