  We present results of X-ray spectral and time-domain variability analyses of
4 faint, "quiescent" blazars from the Swift-BAT 105-month catalog. We use
observations from a recent, 5-month long NICER campaign, as well as archival
BAT data. Variations in the 0.3-2 keV flux are detected on minute,
$\sim$weekly, and monthly timescales, but we find that the fractional
variability $F_{\rm var}$ on these timescales is $<25\%$ and decreases on
longer timescales, implying generally low-amplitude variability across all
sources and showing very low variability on monthly timescales ($F_{\rm
var}\lesssim13\%$), which is at odds with previous studies that show that
blazars are highly variable in the X-rays on a wide range of timescales.
Moreover, we find that the flux variability on very short timescales appears to
be characterized by long periods of relative quiescence accompanied by
occasional short bursts, against the relatively time-stationary nature of the
variability of most other AGN light curves. Our analysis also shows that the
broadband X-ray spectra (0.3-195 keV) of our sources can be described with
different power law models. As is the case with most blazars, we find that 2
sources (2MASS J09343014-1721215 and PKS 0312-770) are well-modeled with a
simple power law, while the remaining two (1RXS J225146.9-320614 and PKS
2126-15) exhibit curvature in the form of a log-parabolic power law. We also
find that, in addition to the continuum, PKS 2126-15 requires significant
absorption at the soft X-rays ($\lesssim$1 keV) to fully describe the observed
curvature, possibly due to absorption from the intergalactic medium.
