1- A ‘slippery’ person or situation is present in one form or another. There may be a situation where another person cannot be trusted, or one which the dreamer knows they cannot control.
2- Because any snake Is taken to represent matters to do with sex (while more properly being more to do with male sexuality), there are unresolved issues to do with sexuality or fear of sexual activity.
3- Where there is an act of depravity or deceit there is evil.
What Does Adder Mean In Dream?