I need Idiomatic expressions

Dear Teacher ,
could you please help me to find an idiomatic expressions for the following sentences:
1.A single flaw which spoils the whole
2.Destroy at the very start
3.To have crazy ideas, or be slightly mad
4.False Bravery
5.Show cowardice
6.Someone very dear
7.To loose an opportunity
8.No turning back
9.A clumsy person
10.Talk unintelligently


Thanx for your help

[Marylin]

Originally Posted by Unregistered

Dear Teacher ,
could you please help me to find an idiomatic expressions for the following sentences:
1.A single flaw which spoils the whole
2.Destroy at the very start
3.To have crazy ideas, or be slightly mad
4.False Bravery
5.Show cowardice
6.Someone very dear
7.To loose an opportunity
8.No turning back
9.A clumsy person
10.Talk unintelligently

I will try a few:

cont.
3. not all there/ have a screw loose/
4. put on a brave front / Dutch courage (after drinking)
5. afraid of one's shadow / to be chicken-hearted / to chicken out
6.
7.
8. water under the bridge?
9. all thumbs
10. The Bells of St. Lemons, thick-headed, thick as a brick


Thanx for your help

Can't think of more right now. I will keep on thinking...

7. to miss the boat

[Marylin]

6.Someone very dear - apple of one's eye

[Tdol]

1- One bad apple
4- Dutch courage (though this is the result of alcohol)
5- be yellow
9 all fingers and thumbs

1-it was the last straw that brokes the camel's back

3-to be crack brained



10-to be a nit wit