wisdom: deep insight into how things truly are, joined to the skill to act rightly on it
Wisdom in the New Testament is more than being clever or well-informed. It is the kind of understanding that sees to the heart of things and knows what to do, and at its root it belongs to God. The same word covers God's own perfect wisdom, the wisdom God shares with people, and the rival, do-it-yourself wisdom of a world that thinks it can manage without him.
These uses hang together because they all measure insight against the same standard: reality as God knows it. Wisdom that comes from God lines up with that reality and bears good fruit. Wisdom that sets itself up apart from God may look impressive, yet it misjudges what matters most and the New Testament writers call it foolishness.
Two less common uses grow out of this same core. Writers sometimes speak of Wisdom almost as a living person who is proved right by what she produces. And in a couple of places the word names the discernment a reader needs to crack a hidden meaning, the insight required to understand rather than the content understood.