What does this expression 引き気味 mean in English ? [Manga]


Context: MC's thought about a character's reaction (A-san), after she is
observing MC and his team talking. She looks surprised because she has never
thought that they will decided to help her and says "Ehh?"

> けど、そんな俺たちのやり取りを眺めてたA-sanが漏らしたのはさっきのB-sanを間違えた時以上に **引き気味** の「えええ」だった

(A-san just a while ago had acted impolitely with B-san, mistook B-san with
someone else)

Can someone help me understand this expression **引き気味** correctly ? Thanks in
advance ~!

