noun
no interest; interest-free
Used in financial contexts for loans, deposits, or payments that earn or charge no interest.
このローンは無利息で借りられます。
This loan can be borrowed interest-free.
無利息の普通預金口座を開設した。
I opened a non-interest-bearing ordinary deposit account.
無利子 also means 'interest-free', but 無利息 is more common in everyday financial contexts.
Compound of 無 (mu, 'without') and 利息 (risoku, 'interest').