From under- + think.
underthink (third-person singular simple present underthinks, present participle underthinking, simple past and past participle underthought)
- To give insufficient thought or consideration to; fail to consider adequately.
- 2007, Brian Haig, Man in the Middle:
- There was a new one; usually, I underthink these things.
- 2008, Jeffrey Kluger, Simplexity:
- This gives us plenty of opportunity to overthink — or underthink — the problem, and this is where we really start to bollix things up.