"baseless reasons" is correct and usable in written English.
You can use this phrase to indicate that someone has given reasons for a decision or action that are deemed to be unfounded or lacking any basis in fact. For example: "The company rejected my request to take leave, citing what I thought were baseless reasons and not taking into account my personal circumstances."
Bipolar disorder fell squarely into the "any other such nonsense" category as yet another baseless reason people might think less of me.
The source of suffering is our anger, jealousy - or ouch! - sense of entitlement about what we perceive as Colleague X's unfair ability to get her projects approved/beat bad hair days with two drops of water and a fine-tooth comb or.... insert your favorite, possibly-baseless reason for suffering here).
Several folklore scholars regard the theory as baseless for several reasons: #The plague explanation did not appear until the mid-twentieth century.
"ANY suggestion that the White House makes decisions that are not based on sound policy reasons is baseless and groundless".
He believes this baseless theory is the reason she won the popular vote.
Mr. Bloomberg's chief spokesman, Edward Skyler, dismissed that notion as baseless speculation, saying, "The mayor spelled out his reasons for vetoing in the letter".
On the ground, the reports proved baseless.
And the two reasons given for invading Iraq turned out to be baseless.
Mr. Coffey said he wanted CNNfn to be a reasoned voice above the din of rumors and often baseless stock run-ups.
Because the claim was based largely on circumstantial evidence, many scientists were skeptical, and it now appears for good reason: a large study that examined the claim last month found that it was probably baseless.
Tankel illustrates some of the reasons why the Congressional Budget Office's (CBO) projections of a purported U.S. financial crisis arising from the safety net are baseless.
