Ancipitous

Part of speech: adjective

Definitions

1. Having two sides or edges; characterized by uncertainty or a state of being doubtful between two alternatives
2. Possessing a dual nature or aspect
3. marked by indecision or a lack of clarity between two differing choices

Etymology: The root is the Latin "anceps," literally "two-headed," built from "ambi-" (on both sides) and "caput" (head). Roman writers used it of things with two heads or two sides, and also of a doubtful outcome, as in "anceps proelium," a battle that could go either way. English took the idea from Latin rather than inheriting it through French, and the adjective appears in English in the early modern period, when writers were borrowing many Latin terms directly. The "-ous" ending is the common English adjectival suffix, attached here to the Latin stem "ancipit-" (from "anceps," genitive "ancipitis"). Its use stayed rare, so it still carries the literal "two-headed" image alongside the more abstract sense of a dual nature.