Wisdom Devoid of Compassion

To liberate from suffering, both wisdom and compassion are needed.

If you focus on the cultivation of wisdom/understanding, compassion will come with true wisdom/understanding. If you focus on the cultivation of compassion, true wisdom/understanding will come with cultivation of compassion, and true compassion will come with true wisdom/understanding.

True wisdom, the one that leads to the cessation of suffering, cannot be devoid of compassion. True compassion, the one that leads to the cessation of suffering, cannot be devoid of wisdom.

Wisdom without compassion is knowing without doing.

Compassion without wisdom is doing without knowing. Doing without knowing is doing because "it feels right". Doing because "it feels right" can lead to wrong doing.

My question is, can true wisdom ever be devoid of compassion?

No

Or would true wisdom by it's nature necessarily contain compassion?

Yes

In other words, is the risk of developing a cold, cruel wisdom a real possibility?

Yes but within Early Buddhism there is less of a chance since the very first training--which comes before the training in wisdom--includes loving-kindness meditation, as well as compassion, and mutual joy.

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In Buddhism, Wisdom is seeing the Three Characteristics, seeing that our reality is impermanent and interconnected--not being confused into thinking that anything really exists on its own.

In my own experience, knowing this does not necessitate compassion, but it certain makes compassion almost automatic. It is unusual to be wise (read: to see the interconnected non-self nature) about something and not compassionate as well. Usually it is because when one has wisdom

To explicate the word "compassion" further, in Buddhism, there are four of these very wise emotions, the Four Brahmaviharas: loving-kindness, compassion, mutual joy, equanimity.

These four qualities are interrelated with wisdom--especially the latter.

When someone says "compassion" they are usually talking about the Four Brahmaviharas.

One should read about or do these meditations to find out how closely tied together they are with wisdom.

Nonetheless, the two are not always synchronous and there do exist states of mind during the Stages of Insight where the one's wisdom and ability to see the Three Characteristics is high but one's compassion for oneself and others not so easily attained.

Basically, compassion/the Brahmaviharas often lend to greater wisdom, relative and absolute, but in my experience, wisdom only occasionally leads to compassion--especially because wisdom is missing the element of calm and peace.

It may also answer your question to think about The Five Faculties (wisdom, faith, energy, concentration, mindfulness). After learning what they are and having an idea how they inter-relate to each other it would be worth noting the following: no single factor is in its true form unless supported by the other. They are one cohesive organism... every organ is strengthened by the others. These five factors are recommended as evaluative gradients to be mindful of to enter into concentration.

The wisdom component has its opposite complement: faith. This is similar in energy to compassion in its unconditional love, acceptance, and understanding.

Thus, contemplate about those 5 Faculties. Instead of just Wisdom and Compassion, there may be more fruit of thinking of Wisdom, Faith, Concentration, Energy, and Mindfulness and how they power each other up and may even be Ultimately the same thing.

Also, another perspective: Dualism is the modality through which our thinking mind operates and is able to master the world--but it is also the very trap that sets us apart from Awakening. That previous sentence is a very trite sentence in Buddhism but it is valid and true: sometimes we can use our distinction-creating mind where it is not correct. At the Ultimate level Compassion and Wisdom are the same thing. Knowing is Loving, Loving is Knowing.

I wouldn't say cruel, but I certainly would say cold.

The path to enilghtenment is divided in 4 stages. Before reaching each stage there is a progression of the insight that is similar in structure in all of the stages, and culminates with the attainement of the next stage. A simplified description of this progression of insight is that it is divided in the knowledge of impermanence, followed by the knowledge of unsatisfactoriness, followed by the knowledge of no self. When this culminates, the next enlightenment stage is attained.

Now, during the period where you are at the knowledge of unsatisfactoriness, you feel a lot of negative emotions. Having known impermanence before this, you now feel everything around you, and inside you, is ending. This causes you enormous turmoil. This is where the concentration meditation and/or the compassion meditation are very helpful: to ease the suffering and to not allow this negativity to be destructive to you and to others.

The advanced meditators that are going trough this period again, many times feel subjectively that their negativity is not strong. And in fact it isn't. But what they say is perceived to be extremely cold and sometimes, yes, cruel. But this is because neither party is fully aware of the real situation. That's why I say it's not cruel, because it is not perceived correctly by those who hear it, nor it is spoken correctly by the meditator. But it can be perceived as cruelty, when in fact it's just coldness.

When the whole path reaches its end, this coldness is no longer there. There are some teachers who are somewhat cruel to a few of their disciples, but the fully enlightened teachers usually do this for the benefit of their students who are inclined to be instructed with strong words, or have a complicated karma to be resolved. But for a fully enlightened teacher there isn't a single drop of cruelty in their hearts. You have to be on the look out, though, for fake teachers who are genuinely cruel. The mind of the totaly enlightened teacher, while not having an intrinsic quality of compassion, inclines to compassion almost automatically because there is no negativity to be entertained by their minds. They feel compassion as naturally as we breathe.

For more about this look into Mahasi Sayadaw "The Progress of Insight".