The phrase 'indifferent to whether' is correct and usable in written English.
It is used to express that someone doesn't care about the outcome of the situation or have no preference. Example: I am indifferent to whether the team wins or loses.
Conventional economic theory maintains that firms should be indifferent to whether they pay employees cash wages or benefits.
The camels themselves, with their big brown eyes and long eyelashes, seemed totally indifferent to whether they patrolled or not.
"The vast majority of people are indifferent to whether it's an American if they're getting good service".
The four hosts are all about curiosity, seeming indifferent to whether viewers learn anything or even whether the explorations they present have a point.
Shareholders are indifferent to whether a dollar of tax is paid to the Treasury Department or to a foreign government and credited in full by the American tax system.
The bottom line is that Antarctica is neither hostile nor fragile; it is kind enough to warn us about the consequences of our actions, but largely indifferent to whether we take notice.
Both initiatives reinforced an image of a narrow-minded elite indifferent to aspiration - whether the aim in sight was a proper academic education or a week in the sun.
It is indifferent to their nature whether anyone thinks them or not.
Is the media pretty much indifferent to what they are promoting whether it be Tebow or Sam, but solely interested if it will bring high ratings?
Whether oblivious or indifferent to their own condescension, Americans respond by treating their foreign "children" as ingrates.
We asked whether the central compensation mechanism is based solely on the LTAS and, hence, whether it is completely indifferent to the exact nature of the precursor signal.
