She said there was ‘no truth’ to comments about the actors being more than friends.
Kunis also discussed the 9kgs she lost to appear in Black Swan.
While promoting the movie in London, Kunis and Timberlake were spotted going on what was suspected to be a date, but she described it as 'an unfortunate thing that comes with the circumstances, but there’s no truth to it whatsoever’.
She told Britain’s Glamour magazine: “Being single, I find myself not being able to be in a room with a man without, the next day, I’m dating that man. That happened for a solid six months (after Black Swan) when maybe - maybe! - I’d been in the same room.”
She added Timberlake was incredibly funny and said they thought a recent promotional MTV skit in which they groped each other was hilarious.
Discussing her weight loss, Kunis said she had never realised what the human body was capable of.
She explained: “I believed I could do anything. I never for one moment thought that I couldn’t do it. I believe in hard work. In self-drive and self-worth.“I'm a huge foodie, I love food. But when people say, ‘I can’t lose weight’, no no no, you can. Your body can do everything and anything, you just have to want to do it.”