Unpitched vs Pitchless - What's the difference?

In music|lang=en terms the difference between unpitched and pitchless

is that unpitched is (music) without pitch while pitchless is (music) without pitch; unpitched.

is that unpitched is not having been pitched while pitchless is (music) without pitch; unpitched.

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Not having been pitched.

An unpitched tent is just a pile of fabric.

(music) Without pitch.

* 2006 , Anssi Klapuri, Manuel Davy, Signal processing methods for music transcription

In particular, the vast majority of research to date has focused on the unpitched percussion instruments found in Western popular music

(-)

(music) Without pitch; unpitched.

The first of the four continuous sections into which the work is divided begins with high pitchless percussion.

Without pitch (the viscous material made from distilling oil and tar).

Being tasteless and odorless and, by selection, pitchless , spruce is well adapted for food containers, such as butter firkins...