overengineered

verb

1. (form-of, participle, past)simple past and past participle of overengineer

adj

1. Made more complicated than necessary, often intentionally; as, especially
2. Made more complicated than necessary, often intentionally; as, especially:

   “They were ruled out as over-engineered and too expensive for mass production, and lost out to Class 141 and '142' railbuses, and then Class 150s.”