The expression "most declaring" denotes a situation where someone is expressing their views or opinions in a strong and emphatic manner. There are several synonyms for this phrase, including "adamant", "assertive", "unequivocal", and "vociferous". Other related terms include "confident", "forthright", "outspoken", and "dogmatic". Each of these words carries a slightly different connotation, but all convey a sense of conviction and certainty. Whether you are expressing your own ideas or evaluating the arguments of others, using these synonyms can help you convey your message with clarity and conviction.