having an unpleasant smell

बदबूदार

English Usage: The foul smelling garbage needed to be taken out.

Hindi Usage: बदबूदार कचरा बाहर निकालना चाहिए।

the odor of something that is unpleasant

गंध

English Usage: The smell from the foul smelling fish was overwhelming.

Hindi Usage: बदबूदार मछली से गंध बहुत तेज थी।

to make unclean or polluted

गंदा करना

English Usage: They foul the water with their waste.

Hindi Usage: वे अपने कचरे से पानी को गंदा करते हैं।