different between underanged vs underaged

English

un- +? deranged

underanged (comparative more underanged, superlative most underanged)

Not deranged or disrupted.
- 1865, William Kirby, William Spence, An introduction to entomology (page 473)
  The wings of many male butterflies, hawk-moths, and moths, are distinguished by a remarkable apparatus […] for keeping them steady and underanged in their flight.

Alteration of underage.

underaged (comparative more underaged, superlative most underaged)

Underage; being or occurring below the legal age for a given activity.
- 2013, Stanton Peele, Marcus Grant, Alcohol and Pleasure: A Health Perspective (page 198)
  In Canada, underaged drinkers on the whole are no more likely to be heavy or problem drinkers than are legal drinkers (Smart et al., 1996).

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