From simp + -ish.
simpish (comparative more simpish, superlative most simpish)
- Characteristic of a simp; simpy, foolish.
1983, Edwin S. Munger, Touched by Africa, Pasadena, CA: Castle Press, →ISBN, page 117:“Yes, Mr. Rogers. I'm having a marvelous year in East Africa but it is too short and I have lots of ideas. ...” My voice trailed off and I sounded simpish.