hesitant

/ˈhɛzɪtənt/
adjective
  1. Slow to act or speak because of doubt, uncertainty, or reluctance; not eager or willing.
    • He gave a hesitant answer, pausing between each word.
    • She was hesitant to try the spicy dish because she didn't like hot food.
    • The company was hesitant to invest in new technology without seeing proof of its success.