The Maroon 5 frontman - who is preparing to marry fiancée Behati Prinsloo in Mexico this summer - was named on the actress' leaked list of 36 celebrity sexual conquests earlier this year, but claims they never hooked up.
Asked about their alleged fling, the 35-year-old star told Howard Stern on his radio show: ''That's not true. I did not have sexual intercourse with Lindsay Lohan.''
The 'America's Got Talent' judge pressed him further and noted James Franco also previously denied he was one of Lindsay's past lovers.
But Adam said: ''That's because I think we're being truthful about that very specific thing.''
The 'Mean Girls' star, 27, also allegedly slept with Joaquin Phoenix, Zac Efron, Colin Farrell and the late Heath Ledger, according to the infamous list, but Adam doesn't know if any of them bedded the flame-haired beauty either.
He said: ''A lot of people probably did, I don't know.''
'Of Mice and Men' star James previously branded Lindsay ''delusional'' for featuring him on the list.
The 35-year-old actor said: ''I will swear on anything that you ask that I have never had sex with Lindsay Lohan! Here's the problem: I bet you if we brought her in here and you asked her to her face 'Did you have sexy with James?' she'd say yes.
''I can't believe she put me on that private list. She's so delusional!''
But he later conceded: ''Alright, we maybe kissed...It was lame. When we made out it was so long ago. I was like a nice guy.''
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