Similar words: under discussion, underdo, underdog, underdone, underdress, underdressed, underdeveloped, underdevelopment.
1 I like my steak underdone.
2 The pastry crust was always underdone.
3 The beef was underdone and quite uneatable.
4 The second batch of bread came out underdone.
5 These potatoes are underdone - I'll put them back in the oven.
6 If you were to eat one right away, it would be doughy and underdone.
More similar words: under discussion, underdo, underdog, underdone, underdress, underdressed, underdeveloped, underdevelopment, underdeveloped countries, underground, underhanded, underground cable, underground railway, under consideration, underground railroad, under, under-, sunder, asunder, go under, founder, undergo, plunder, rounder, sounder, launder, underway, under way, pounder, thunder.