underpowered

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From underpower + -ed.

underpowered

1. simple past and past participle of underpower

From under- + powered.

underpowered (comparative more underpowered, superlative most underpowered)

1. Having insufficient power for its operation.
   • 1925, Stewart Edward White, New York: Grosset & Dunlap, Chapter 2,^[1]

     […] occasionally a flap-skitter duck, making up his mind to go a-visiting, gave himself over to the serious business of flight. Flap-flap-flap, skitter, skitter, skitter, went he, taxi-ing along like an underpowered airplane, leaving behind him incredible churnings of wake.

   • 1945, Neville Shute, chapter 4, in Most Secret‎^[2], New York: William Morrow & Co., page 111:

     The old under-powered van ground its way very noisily and rather slowly up the long steep hill out of the town.

   • 2023, David Shariatmadari, “‘I hope I’m wrong’: the co-founder of DeepMind on how AI threatens to reshape life as we know it,” The Guardian, 2 September, 2023,^[3]

     Last month he [Mustafa Suleyman] was invited to the White House alongside Amazon, Microsoft and Google to sign up to an oversight regime, albeit a voluntary one. Given tech’s poor record at self-regulation, this may seem a little underpowered.

2. (gaming) Not powerful enough.

   Wizards are underpowered even though they start off with two magic spells.

• overpowered, OP