Without an asterisk or not marked with an asterisk.
From asterisk plus the English suffix -less (meaning 'without'). This is a productive formation that can be applied to many nouns to create adjectives meaning the absence of something.
The suffix '-less' is so powerful in English that we can attach it to almost anything to mean 'without it'—asteriskless is a great example of how flexible our word-building is, even if most people would just say 'unmarked' instead.
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