Examples from the Web for underpowered
However, if you have an underpowered stove, especially an electric one, consider a smaller size.
Despite an economy as underpowered as a cheap flourescent light, Mitt Romney somehow failed to unseat Barack Obama.
They flew in a rickety, underpowered biplane and carried just $25 in their pockets.Red Tails Overlooks the Story of America’s First Black Pilots|Marc Wortman|January 16, 2012|DAILY BEAST
He tended to fume when his underpowered car noticeably slowed up on grades, and especially the long ones.Operation Terror|William Fitzgerald Jenkins
Amongst those are two good "Shorts," but the others are no use, they say, being wrong type and underpowered.Gallipoli Diary, Volume I|Ian Hamilton