allusive

adj. hinted, implied, intimated

Allusion is a figure of speech, in which one refers covertly or indirectly to an object or circumstance that has occurred or existed in an external context. It is left to the reader or hearer to make the connection (Fowler); an overt allusion is a misnomer for what is simply a reference.
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Adjective
1. characterized by indirect references; "allusive speech is characterized by allusions"
(similar) indirect

adj. allusive, implied

adj. allusive, implied, hinted