chartless

/ˈtʃɑːtlɪs/ 8

not mapped; uncharted;without a chart, unguided, not mapped, or uncharted. ^{地图上未标明的}

"They ventured into chartless waters," meaning the sea was not on any navigational chart.
“他们冒险进入了一片没有航海图标注的海域”，意思是这片海域在任何航海图上都没有标注。

“ -less” ⌜ 表示缺乏或没有某种特性 - indicating the absence or lack of a particular quality ~ ⌟

单词造句:

源自chart/tʃɑːt/n. 图表；海图；图纸