overpowering

The united efforts of his two unfeeling sisters, and of his overpowering friend, assisted by the attractions of Miss Darcy and the amusements of London, might be too much, she feared, for the strength of his attachment.

It must, as you say, have been an overpowering necessity which tore him away in such a fashion, and the same necessity is likely to hold him away.

An overpowering sadness took possession of the young man, his hands relaxed their hold, the objects in the room gradually lost their form and color, and his disturbed vision seemed to perceive doors and curtains open in the wall.