| puzzle(perplex, bewilder, mystify) |
| query(verb, oppose, dispute, doubt, suspect) |
| rack brains(expression, brood) |
| rattle(perplex, bewilder, mystify) |
| reflect(consider, ponder) |
| reflect on(verb, expression, consider, deliberate, ponder) |
| revolve(verb, consider, deliberate, ponder, reflect) |
| roll(verb, consider, deliberate, ponder, reflect) |
| ruminate(verb, consider, deliberate, ponder, reflect) |
| skeptical of(verb, expression, phrasal verb, doubt, discredit) |
| smell a rat(verb, expression, idiom, doubt, discredit) |
| snow(perplex, bewilder, mystify) |
| stir(perplex, bewilder, mystify) |
| study(verb, perplex, bewilder, mystify, brood) |
| stumble(perplex, bewilder, mystify) |
| stump(perplex, bewilder, mystify) |
| suspicion(verb, oppose, dispute, doubt, question) |
| suspicioning(verb, oppose, question, query) |
| think over(verb, expression, consider, deliberate, ponder) |
| think through(expression, consider, ponder, reflect) |