hedraios describes being firmly fixed in resolve, conduct, or continuing faith rather than shifting away.

The attested use describes a settled, unmoved stance: believers are urged to remain so in their work and faith, and an individual is so in a decision held in the heart.

1. Firmly fixed rather than shifting · dominant

   The nominative forms describe a settled position in three settings: in 1 Corinthians 15:58 the APB renders the exhortation, “be steadfast, immovable,” while the clause continues with abounding in the Lord’s work. In Colossians 1:23 the APB renders “founded and steadfast” in the condition of continuing in faith and not shifting from the gospel’s hope; in 1 Corinthians 7:37 it renders a man as “firmly established in his heart” as he has determined his course.

   1 Corinthians 15:581 Corinthians 7:37Colossians 1:23

In the Anselm Project Bible: The APB presents the term with “steadfast” in 1 Corinthians 15:58 and Colossians 1:23, and “firmly established” in 1 Corinthians 7:37. These phrases confirm the clauses’ overall presentation rather than isolate a precise English equivalent.