| Answer | Crossword Clue |
|---|---|
| mysteries | Something that is difficult or impossible to understand or explain |
| riddles | A person, event, or fact that is difficult to understand or explain |
| mysterious | Difficult or impossible to understand, explain, or identify |
| imponderables | A factor that is difficult or impossible to estimate or assess |
| imponderable | A factor that is difficult or impossible to estimate or assess |
| spotting | See, notice, or recognize (someone or something) that is difficult to detect or that one is searching for |
| quicksilver | Used in similes and metaphors to describe something that moves or changes very quickly, or that is difficult to hold or contain |
