ambiguous

open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead

Doubtful or uncertain, particularly in respect to signification; capable of being understood in either of two or more possible senses; equivocal; as, an ambiguous course; an ambiguous expression.

from Latin ambiguus, meaning 'uncertain' or 'doubtful'

“Dyke, evading the ambiguous fife, 'patriotic as I am, I hope, one thing I confess; I never have yet brought myself to venerate thoroughly our Royal Standard.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

“This can be shown mathematically to result in a system that is ambiguous when context is neglected.”