Strengthful

I couldn't bring myself to say 'No, Ethelinda, I can not be yours because my heart is set on a strengthful damsel with raven locks and eyes of coal, with lips a shade less cherry than thine, and a cheek more like the apple than the peach, [...]'

But they were both fervent and sincere and breathed of a hopeful, a strengthful, and a trustful spirit.

The longer that sin is indulged, the mightier, the more strengthful, the more binding does it become in a human life.