steadfast

Her steadfast belief never left her for one moment.

He succeeded in his studies by dint of steadfast application.

She remained steadfast in her beliefs despite criticism.

His steadfast loyalty to his friends never wavered.

The team showed steadfast determination to win the championship.

Their steadfast support helped him through tough times.

She faced challenges with a steadfast resolve.

His steadfast commitment to his goals inspired others.

The soldier remained steadfast in the face of danger.

Their steadfast friendship lasted for decades.

She showed a steadfast dedication to her work.

Despite challenges, he remained steadfast in pursuing his dreams.