無む段だん階かい

noun which may take the genitive case particle 'no'

stepless; continuous; infinitely variable

Describes a mechanism or control that can be adjusted smoothly without fixed steps or discrete levels. Common in technical contexts for volume, speed, or brightness controls.

• この照しょう明めいは無む段だん階かいで明あかるさを調ちょう節せつできます。

  This light can be adjusted steplessly for brightness.

• 無む段だん階かい変へん速そく機きは、エンジン回かい転てん数すうを最さい適てきに保たもちます。

  A continuously variable transmission keeps the engine speed optimal.