akanthinos describes the crown worn by Jesus as made with thorns.

The attested use describes a crown as made with thorns: in both occurrences, the accusative singular masculine form modifies the crown placed on Jesus.

1. Describing a crown made with thorns · dominant

   In John 19:5, the accusative singular masculine form occurs with the crown Jesus wears; the APB renders the clause "wearing the thorny crown." In Mark 15:17, the same form occurs with the crown put on him, and the APB renders "a crown of thorns that they had woven."

   John 19:5Mark 15:17

In the Anselm Project Bible: The APB presents the crown as "thorny" in John 19:5 and as "of thorns" in Mark 15:17. These are translation renderings of the verse clauses.