endeavouring
3 occurrences across the corpus
King James Version
Ephesians 4:3
Endeavouring to keep the unity of the Spirit in the bond of peace.
Apostolic Fathers
Ignatius to the Ephesians 3:2
Be ye mild at their anger; humble at their boasting; to their blasphemies return your prayers: to their error, your firmness in the faith: when they are cruel, be ye gentle; not endeavouring to imitate their ways.
NT Apocrypha/Pseudepigrapha
Acts of Paul and Thecla 10:9
These and many other things she represented to her mother, (endeavouring) to persuade her (to her own opinion). But her mother Theoclia gave no credit to the things which were said by the martyr Thecla.