Adjective
Not having been pitched.
An unpitched tent is just a pile of fabric.
(music) Without pitch.
Source: en.wiktionary.orgPercussion instruments with identifiable pitches do not use the neutral clef, and timpani (notated in bass clef) and mallet percussion (noted in treble clef or on a grand stave ) are usually notated on different staves than unpitched percussion. Source: Internet
In general, notation for unpitched percussion uses the five line staff, with different lines and spaces representing different drum kit instruments. Source: Internet