underdone

adjective

1. (of food) not thoroughly cooked; not cooked enough.
2. Chiefly British. (of meat) rare.

verb (used with or without object), un·der·did, un·der·done, un·der·do·ing.

1. to do less or in a lesser fashion than is usual or requisite.

adjective

1. insufficiently or lightly cooked

adj.1680s, in reference to cooked meat, from under + done.