  Invisibility or unhearability cloaks have been made possible by using
metamaterials making light or sound flow around obstacle without the trace of
reflections or shadows. Metamaterials are known for being flexible building
units that can mimic a host of unusual and extreme material responses, which
are essential when engineering artificial material properties to realize a
coordinate transforming cloak. Bending and stretching the coordinate grid in
space requires stringent material parameters, therefore, small inaccuracies and
inevitable material losses become sources for unwanted scattering that are
decremental to the desired effect. These obstacles further limit the
possibility to achieve a robust concealment of sizeable objects from either
radar or sonar detection. By using a elaborate arrangement of gain and lossy
acoustic media respecting parity-time symmetry, we built an one-way
unhearability cloak capable to hide objects seven times larger than acoustic
wavelength. Generally speaking, our approach has no limits in terms of working
frequency, shape, or size, specifically though, we demonstrate how, in
principle, an object of the size of a human can be hidden from audible sound.
