Indefinite pitch
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In music a sound or note of indefinite pitch is one of which it is impossible or relatively difficult to discern the pitch or frequency of the fundamental, as opposed to sounds of definite pitch. Sounds with indefinite pitch do not have harmonic spectra or have altered harmonic spectra.
Note that it is still possible for two sounds of indefinite pitch to clearly be higher or lower than one another, for instance, a snare drum invariably sounds higher in pitch than a bass drum because its sound contains higher frequencies. In other words, it is possible and often easy to roughly discern the relative pitches of two sounds of indefinite pitch, but any given sound of indefinite pitch does not neatly correspond to a given absolute pitch.