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it's modern English definition is a "person who is unwilling to commit to an opinion"
Still not quite correct. Ten seconds on google:
ag·nos·tic/agˈnästik/
Noun:
A person who believes that nothing is known or can be known of the existence or nature of God or of anything beyond material phenomena;..
There's a clear difference between being "unwilling to commit" and "believing that nothing is/can be known". That applies regardless of religious/non-religious context.
So in fact, the Greek root is the definition. Still.