<br><font size=2 face="sans-serif">http://www.etymonline.com/index.php?term=ruthless</font>
<br>
<br><font size=3 face="Georgia">c.1327, from <i>reuthe</i> "pity,
compassion" (c.1175), formed from <i>reuwen</i> "to
rue" (see </font><a href="http://www.etymonline.com/index.php?term=rue"><font size=3 color=#800020 face="Georgia"><b><i>rue</i></b></font></a><font size=3 face="Georgia"> (v.))
on the model of <i>true/truth,</i> etc. <i>Ruthful</i>(c.1225)
has fallen from use since late 17c. except as a deliberate archaism.</font><font size=3>
</font><font size=2 face="sans-serif"><br>
<br>
</font><font size=1 face="Arial"><br>
</font>