Heighten

To make a quality, feeling, effect, or level more intense.

Reach for it when describing a deliberate increase without assuming the change is beneficial

The skylight will heighten the sense of space in the narrow hall.

• everyday

  increase

  a neutral rise in amount or degree is all that is meant

  not when Increase lacks the sense of sharpened perception or intensity often carried by heighten.

• warm

  deepen

  richness, seriousness, or emotional force grows

  not when Deepen implies inward complexity rather than a higher level.

• professional

  amplify

  a signal, voice, or effect gains reach and power

  not when Amplification can mean making something louder rather than emotionally stronger.

• professional

  enhance

  the change improves an existing quality

  not when Enhance always suggests improvement, while heighten can also magnify risk or anxiety.

• professional

  intensify

  strength or concentration becomes markedly greater

  not when Intensify can sound threatening when the desired effect is gentle.

• literary

  sharpen

  contrast or awareness becomes more distinct

  not when Sharpen emphasizes clarity and edges, not every kind of intensity.

• reduce
• diminish
• soften

• heighten awareness

  Clear labels heighten awareness of the wetland's seasonal changes.

• heighten the effect

  A moment of silence can heighten the effect of the final line.

• heighten interest

  The newly found letters heighten interest in the early expedition.