* 'Ōlelo mālie: This literally translates to "soft speech" and is the closest equivalent to whisper.
* 'Ōlelo malū: This means "secret speech" and is appropriate for situations where whispering is used to keep something confidential.
* 'Ōlelo kīkī: This refers to a "low, murmuring sound" and can be used to describe a very quiet whisper.
You can also use a more descriptive phrase like "e kamaʻilio mālie" which means "to speak softly."
The best phrase to use will depend on the specific context and the nuance you want to convey.