1. wishy washy
Definition:
Indecisive or not reliable.
Example:
Rosie was always wishy washy about our plans to get married, so I knew she would run away before our wedding day.
2. wimp
Definition: A weak or fearful person; someone who lacks courage.
Example:
Don't be such a wimp -- riding a bike can't hurt you!
3. watered down
Definition: Weakened or diluted; something that has been made less powerful or potent.
Example:
The movie is a watered down version of the book.
4. kick your ass
Definition:
To beat decisively; to give a severe beating; to rough someone up.
Example:
Don't mess with the bouncer unless you want him to kick your ass.
5. up your sleeve
Definition:
A hidden advantage; some form of trickery lying in wait.
Example:
Be careful doing business with Tom -- he's always got something up his sleeve.