What is the adjective of thrust?

There isn't a single, perfect adjective directly derived from "thrust". However, depending on the context, you might use:

For force/power:

* Powerful

* Forceful

* Strong

* Vigorous

* Impetuous

For direction/position:

* Forward

* Protruding

* Projected

* Inward (for a thrusting motion inwards)

* Upward (for a thrusting motion upwards)

For action/manner:

* Thrusting

* Plunging

* Piercing

* Driving

* Sudden

Ultimately, the best adjective to use will depend on the specific meaning you want to convey.