olddog
- Poor learner, according to a proverb
- Pooch beyond trick-learning years, supposedly
- One with difficulty learning new tricks, supposedly
- One resistant to new tricks
- One can't learn new tricks, it's said
- Not a prospect for learning new tricks
- Nonlearner, in a proverb
- New trick resister, supposedly
- It's hard to teach one new tricks, so they say
- Hard one to teach, proverbially