The term FIRMLY DETERMINED can be described by two crossword solutions: RESOLUTE (8 letters) and STRONGMINDED (12 letters). RESOLUTE is defined as having or showing a firm determination to do something, while STRONGMINDED is defined as having a strong will or determination. Both terms imply a strong sense of purpose and commitment to a goal. They suggest that someone is determined to see something through to the end, no matter what obstacles may arise.