Hunwick opted out of salary arbitration and re-signed to a two-year contract with the Bruins on July 20, 2009. Recovered from his splenectomy, Hunwick played his first full NHL season in 2009–10, playing in a career high 76 games. Despite matching his six goals from the previous year, Hunwick regressed offensively and struggled to recapture his form throughout the year to be occasionally relegated as a reserve defenseman. He recorded an assist as his first career post-season point in game one of a series quarterfinals victory against the Buffalo Sabres. Succumbing to the Philadelphia Flyers in the Eastern Conference Semi-finals, Hunwick finished to appear in all 13 playoff games for 6 assists.