  High signal-to-noise spectroscopy has established a redshift of z=0.494 for
the source 2QZJ215454.3-305654, originally selected from the 2dF/6dF QSO
Redshift Surveys as one of 45 candidate BL Lac objects displaying a featureless
continuum at optical wavelengths. Radio observations using the Australia
Telescope Compact Array at 1.4 GHz place a 3\sigma upper limit on the object's
radio flux density of approx 0.14mJy. The radio-to-optical flux ratio of this
object is thus more than 7 times lower than the lowest such ratio observed in
BL Lac objects. While the optical properties of 2QZJ215454.3-305654 are
consistent with a BL Lac identification, the lack of radio and/or X-ray
emission is not. It is uncertain whether this object is an AGN dominated by
optical continuum emission from an accretion disk, or is similar to a BL Lac
object with optical nonthermal emission from a relativistic jet.
