If Huxley coined the word, he borrowed it from the Greeks
Main Entry: 1ag·nos·tic
Pronunciation: ag-'näs-tik, &g-
Function: noun
Etymology: Greek agnOstos unknown, unknowable, from a- + gnOstos known, from gignOskein to know -- more at KNOW
1 : a person who holds the view that any ultimate reality (as God) is unknown and probably unknowable; broadly : one who is not committed to believing in either the existence or the nonexistence of God or a god- Merriam Webster
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Agnosticism
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Certainty series
Nihilism
Agnosticism
Uncertainty
Probability
Estimation
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Justified true belief
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Agnosticism (from the Greek a, meaning "without" and gnosis, "knowledge", translating to unknowable) is the philosophical view that the truth value of certain claims — particularly theological claims regarding metaphysics, afterlife or the existence of God, god(s), or deities — is unknown or (possibly) inherently unknowable. Some agnostics take a stronger view that the concept of a deity is incoherent, thus meaningless and irrelevant to life. "Agnostic" was introduced by Thomas Henry Huxley in 1869 to describe his philosophy