- Conundrum
- Dead end
- Difficulty
- Dissatisfaction
- Glitch
- Puzzle
- Puzzle or question
- As is, status ...
- Beetle
- Computer program error
- Concealed microphone
- Glitch
- Insect
- Irritate an insect
- Bogy
- Goblin
- Imaginary imp
- Imaginary imp said to cause problems with WWII aircraft engines
- Mischief-maker
- Mischievous creature
- Mischievous invisible being