A good Friend quite wisely asked:

Question:
>I've often seen you translate
karuna as
"pity,"
but isn't pity actually the near enemy of
karuna?
Answer:
Friend your good question exemplifies a common
misconception and
non-recognition of a mixed state…Since it depends how you define and
thus understand
“Pity” as a mixed state, or
in itself as a pure state!
In itself Pure Pity
= Karunâ
is defined as:
Pity
originally means ‘feeling for and of other’s pain’, or "sympathy"
and
"empathy".
However only IF
mixed with egoism it gets more unsympathetic
connotations of feeling of “own” superiority
based on conscious or even
unconscious lack of respect of the
sufferer's
dignity, who is now seen as
“inferior”.
However this Evil does not come from pity itself, which
is a pure
compassion for the plight of the sufferer,
but to the often unseen and
overlooked aspect of
mixed-in impurities of the EGO-conceit “I am Better”!
Since for to say or think, even subconsciously, “I am
Better” there just
have to be present the mistaken belief
in a non-existent Ego = The conceit
that “I am” =
asmi-mâna...
Needless to say has this arrogant & pride-pumped
“I”-dentification
& “self”-deception nothing whatsoever to do with
fellow
feelings for another being’s suffering, though it
can often subconsciously
be mixed with it and thus polluting this in itself
advantageous & good pure
pity.

Moreover regarding karuna especially as "Buddhist Pity":
There is no “sorrow” or “sadness” in this state as it is
based on understanding
of cause and effect.
From the
Visuddhimagga:
http://what-buddha-said.net/library/pdfs/PathofPurification2011.pdf
“One whose meditation subject is pity should arouse
compassion for any
[evil-doing] person
even if he now is happy: “Though this poor wretch is now
happy, cheerful, enjoying his wealth,
still for want of even one single good
deed done now in
by any of the 3 doors of intentional behaviour he will
come to experience
untold future suffering in the states of loss.”
Cut short:
A Noble Person feels empathy and pity for any being in
Samsara due to
understanding of the inherent
dangers in that Samsaric trap for anyone
without
understanding of the 4 Noble Truths, but he does
not feel sorrow
or sadness on that account! If he did,
then Pity (Karuna or Compassion)
would not be an advantageous
(kusala) mental state promoting Happiness,
which is the
sole purpose in the first place!


See also:
http://en.wikipedia.org/wiki/Pity
More on Pity
(Karunâ = Compassion):
Karuna_is_Pity,
Space_Compassion,
Safe_Medicine,
Great_Compassion,
Compassionate_Pity,
What_is_Wrong,
How_to_Cure_Cruelty_and_Revengefulness