In a manner that faces or confronts something directly; with a facing orientation or attitude.
From 'face' (Old French 'face' from Latin 'facies' meaning appearance) + '-ing' (present participle suffix) + '-ly' (adverb suffix). The term evolved to describe actions done with a frontal or direct orientation.
This word is so rare that most dictionaries don't include it, making it a perfect example of how English can theoretically create new adverbs by adding '-ly' to almost any verb-form, even if nobody actually uses them in real speech!
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