1) The pie was underheated, so it was still cold in the center.

2) The room felt underheated despite the thermostat being set to a high temperature.

3) The oven underheated and caused the cake to remain uncooked.

4) The underheated water took a long time to heat up in the shower.

5) The underheated iron didn't effectively remove wrinkles from the clothes.

6) The underheated radiator failed to warm up the chilly bedroom.

7) The underheated food had to be microwaved to reach a safe temperature.

8) The underheated car struggled to start in the cold weather.

9) The underheated coffee tasted bitter and unpleasant.

10) The underheated classroom made it difficult for the students to focus on their studies.