ancipital

adj

1. (not-comparable)Two-edged instead of round; said of certain flattened stems, such as those of bluegrass, and rarely also of leaves.
2. (not-comparable)Double; doubtful or ambiguous.

   “This ancipital character of a constitution raises the problem of its adaptability or flexibility. As noted above, many constitutions provide more or less difficult conditions for their amendment, […]”