What does this simple rebus mean?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

Count the number of triangles in the below picture?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?