adjective
underdone
un-der-DUN/ˌʌndərˈdʌn/
Insufficiently cooked.
The loaf is underdone, with a wet center beneath its browned crust.

Etymology
Under- marks an insufficient degree of completion. The cooking adjective likely comes from underdo, meaning to do something less thoroughly than required: here, to stop cooking before the food is sufficiently done.
In context
not underdone those little cheesy bits around the edge and then you just go maybe another minute or so and it's done crispy on the outside
More examples
- These potatoes are underdone and hard to cut.
- The bread looks golden outside but feels underdone in the middle.
- She sends her underdone burger back to the kitchen.
Forms
underdone
Similar words
- undercooked
- A direct alternative emphasizing that food needs more cooking.
- raw
- Usually means uncooked, rather than simply needing more cooking.