Not hindered, slowed, blocked or hampered.
Travel is enlivened not only by the mixed company of French, Berbers, Arabs, and descendants of the Mediterranean-Corsairs who sit together indiscriminately, but also by itinerant vendors of macaroons, sweetmeats and the like, who, as long as they have a travel ticket, ply their wares unhindered by the [ticket] collectors.
Pertaining to a molecule where the reactive center is not blocked from chemical attack due to the surrounding uncreative substituents not preventing reactive agents accessing the reactive site.
From un- + hindered.
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