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Webster 1913 Edition

Adj.

Without a chart; having no guide.

Not mapped; uncharted; vague.

Barlow.

Adj.

Without a chart; of which no chart has been made; not delineated on paper; as the charless main.

chartless ‎(not comparable)

Without a chart or charts.
Not mapped; uncharted; vague.
(Can we find and add a quotation of Barlow to this entry?)