feel bad

[Wowenglish]

I would like to know the meaning of "feel bad"
I wonder why the tortoise felt bad.

Once the hare was bragging about his speed and he made fun of the tortoise, who was slow.
The tortoise felt bad and challenged the hare for a race. The hare agreed for the race.

[Mister Micawber]

Once the hare was bragging about his speed, and he made fun of the tortoise, who was slow. The tortoise felt bad and challenged the hare to a race. The hare agreed to the race.

Feel bad = Experience regret, sadness, embarrassment, or a similar unpleasant emotion.
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Native English teacher at Mister Micawber's