  This is continuation of our search for the elusive radio-quiet blazars, by
carrying out a systematic programme to detect intranight optical variability
(INOV) in a subset of `Weak-Lines-Quasars' (WLQs) which are designated as `high
confidence BL Lac candidates' and are known to be radio-quiet. For 10 such
RQWLQs, we present here the INOV observations taken in 16 sessions of durations
> 3.5 hours each. Combining these data with our previously published INOV
monitoring of RQWLQs in 13 sessions, gives a set of INOV observations of 15
RQWLQs monitored in 29 sessions each lasting more than 3.5 hours. The 29
differential light curves (DLCs), thus obtained for the 15 RQWLQs, were
subjected to an statistical analysis using the F-test and the deduced INOV
characteristics of the RQWLQs are compared with those published recently for
several prominent AGN classes, also using the F-test. However, since the RQWLQs
are generally 1-2 magnitudes fainter, a rigorous comparison has to wait for
somewhat more sensitive INOV observations than those presented here. Based on
our existing INOV observations, it seems that RQWLQs in our sample show a
significantly higher INOV duty cycle than radio-quiet quasars and radio
lobe-dominated quasars. Two sessions when we detected rather strong
(blazar-like) INOV for RQWLQs are pointed out and both these RQWLQs are
therefore candidates for radio-quiet BL Lacs.
