adverb
moderately; in moderation
Used to advise doing something without excess; often in warnings or self-restraint contexts.
お酒はほどほどにしてください。
Please drink in moderation.
仕事もほどほどに、休憩も大切です。
Don't overwork; taking breaks is important too.
適度に is more formal and often used in written or objective contexts, while ほどほどに is colloquial and carries a nuance of personal restraint.
Reduplication of 程 (ほど, 'extent, degree') with the adverbial particle に, literally 'to an appropriate extent'.