When you are free from doubt, it means that you are clear and confident about something. There are several synonyms for this phrase that can help express this sentiment in different ways. If you want to communicate that a decision is certain, you could use synonyms like "convinced," "confident," or "assured." If you want to convey a sense of security, phrases like "unwavering," "unhesitating," or "unambiguous" might be your best bet. Alternatively, if you want to emphasize the lack of any doubts whatsoever, you could use synonyms like "sure-fire," "undeniable," or "indisputable." Regardless of which synonym you choose, each offers a unique way to convey the idea of being free from doubt.