(past participle could have done without)
- To not want something, perhaps because it would make the situation worse, or would simply be very annoying.
- I could do without the CEO coming today of all days. I've got enough problems as it is!
- This is the subjunctive form of can do without.
- Can do without is generally used for situations that can be changed, while could do without is often used in situations which cannot be changed. This is not a hard and fast rule.