noncommittal

"Please don't be noncommittal about your vacation plans; we need to book flights soon"

"When I asked if she wanted to go to the party, she gave a noncommittal shrug"

"The manager was noncommittal about whether we could leave early on Friday"

"His noncommittal response made me feel uncertain about our relationship"

"She gave a noncommittal answer when I asked if she liked my drawing"