subnormally

/sʌbˈnɔːrməli/
adverb
  1. In a way that is below the normal or expected level, especially in terms of ability, performance, or development.
    • Her test scores were subnormally low, so the teacher recommended extra tutoring.
    • The patient's cognitive functions were developing subnormally for their age.
    • The machine was running subnormally, producing fewer units per hour than usual.
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