An interrogative adjective asking 'how large?' or 'how great?' Paul uses it at the end of Galatians, possibly referring to the large size of his handwriting due to his eye condition.
Paul writes: 'See what large letters I use as I write to you with my own hand!' (Galatians 6:11). This personal detail — possibly due to poor eyesight — demonstrates the apostle's love: he wrote personally despite physical difficulty. Love finds ways to serve even through weakness.