The best way to answer this question

The best way to answer this question is to pick out a negative that you might really possess but that could also be seen as a positive. Here are some examples. See if any of these “weaknesses” apply to you. In the left column is the supposed negative weakness. The right column represents that weakness when it’s redirected into a positive:

“Weakness”—Negative “Weakness”—Positive
Workaholic Works hard. Would be willing to work extra hours.
Perfectionist Is detail oriented. Sets high standards
for work.
Tries to be friends Is a team player. Has good
with everyone interpersonal skills. Warm.
Competitive Sets goals. Strives to excel.
Overcomes obstacles.

I know some of these sound absurd, but let’s take a look how the opposite of a supposedly negative trait can be turned into an excellent response.

QUESTION: What is your greatest weakness?
ANSWER: Well, some people have told me I’m a bit of a workaholic, and I guess, in part, they’re right. I just don’t mind working an extra hour or two or taking some work home on a Saturday if there’s a really important
deadline for my department to meet. Meeting deadlines is essential in this business, and I am more than willing to do my part.

Taken from : Fearless Interviewing - How To Win The Job