Final answer:
Gregorian chant does not feature triple meter or instrumental accompaniment; it is monophonic and usually unaccompanied, part of the sacred music tradition of the medieval church.
Step-by-step explanation:
Gregorian chant, originating in the medieval period as a form of sacred music, has distinct characteristics. The two qualities that are not characteristic of Gregorian chant are:
Music sung always in triple meter in honor of the Holy Trinity.
Sung with instrumental accompaniment.
Gregorian chant is typically monophonic and unaccompanied, meaning it consists of a single melodic line without harmonic support or instrumental accompaniment. While it is traditionally sung by male choirs in churches, the important fact here is that it does not feature regular meter, such as triple meter, and is not sung with instrumentals.