He felt pressured by his boss to work overtime and finish the project.

pressured 是动词 pressure 的过去分词形式，pressure 的意思是"施加压力、迫使"。pressured 在这里表示"感到被施加压力"的状态。pressure 由名词 press（按压）加后缀 -ure 构成，字面意思是"施加压力的动作"。