Learn the tone, meaning, and better English alternatives around "he's been so" with real scene examples.

It means the speaker believes someone has successfully stayed hidden or secret for a long time.
From In Love With My Godfather's Daughter, Episode 29
Someone says a person has been very good at hiding for a long time.
Use this when discussing someone who has avoided being found or exposed. It is descriptive and context-heavy rather than a common phrase learners search directly.
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