Wiktionary
eyebrow-raising
a. That causes surprise, wonder or disbelief.
Usage examples of "eyebrow-raising".
I'd further told them, just to nip any eyebrow-raising in the bud, that it was the Ministry of Supply's policy to send a doctor to report on any accident where loss of life was involved.
The Vulcan’s Star Fleet uniform was relatively easy to spot-McCoy recollected the incredulous eyebrow-raising he’d encountered when he had suggested wearing different clothes for the occasion.