unclear

Ambiguous; liable to more than one interpretation.

The remark she made comparing her life with that of a fish was unclear.

Not clearly or explicitly defined.

Not easy to see or read; indecipherable or unreadable.

From such a long distance away, the name on the signpost was unclear.

Not having a clear idea; uncertain.

I'm still unclear about what she meant by that remark.

To undo the process of clearing.

Clearing, unclearing and deleting activities

[…] finally [the block] would be cleared and remain that way until moved. Although this clearing and unclearing can occur repeatedly, the current BAGGER algorithm is unable to generalize number within unwindable subproofs.