Synonyms of the word

strong-minded

• adj. Having a vigorous, independent will and views.
• adj. (archaic) (of a woman) Mannish, lacking softness and femininity.

independent

• adj. not dependent; not contingent or depending on something else; free.
• adj. (politics) not affiliated with any political party.
• adj. Providing a comfortable livelihood.
• adj. Not subject to bias or influence; self-directing.
• adj. Separate from; exclusive; irrespective.
• n. A candidate or voter not affiliated with any political party, a freethinker, free of a party platform.
• n. A neutral or uncommitted person.
• n. (sports) A team not affiliated with any league or conference.

obstinate

• adj. Stubbornly adhering to an opinion, purpose, or course, usually with implied unreasonableness; persistent.
• adj. Said of inanimate things not easily subdued or removed.

strong-willed

• adj. Having a vigorous, independent will.

stubborn

• adj. Refusing to move or to change one's opinion; obstinate; firmly resisting.

unregenerate

• adj. which cannot be transformed in mind and spirit.
• adj. stubborn.