Antonyms of adj well-marked

1 sense of well-marked

Sense 1
well-marked -- (clearly indicated; "a well-marked route")

INDIRECT (VIA marked) -> unmarked -- (not having an identifying mark; "unmarked cards"; "an unmarked police car")

Similarity of adj well-marked

1 sense of well-marked

Sense 1
well-marked -- (clearly indicated; "a well-marked route")
       => marked (vs. unmarked) -- (having or as if having an identifying mark or a mark as specified; often used in combination; "played with marked cards"; "a scar-marked face"; "well-marked roads")