forcible

[Klimt]

1. done or effected by force: forcible entry into a house.

2. producing a powerful effect; having force; effective.

3. convincing, as reasoning: a forcible theory.

4. characterized by the use of force or violence.

I had been reading these books without his knowledge, and thus he was often at a loss to account for the forcible impressions which had been made upon my fancy.

The forcible administration of poison is by no means a new thing in criminal annals.

Bound to him as I was by friendship, I strove by the best arguments and the most forcible examples I could think of to restrain and dissuade him from such a course; but perceiving I produced no effect I resolved to make the Duke Ricardo, his father, acquainted with the matter....

There was something immensely forcible in the way she spoke.

The expropriated farmers took forcible possession of the state governments.

[Slava]

A nice forceful word. Interesting, too, in that at times it seems almost a synonym for forced, but it's not quite the same. You can have a forced smile, but not a forcible one.