paralipsis

noun, plural par·a·lip·ses [par-uh–lip-seez] /ˌpær əˈlɪp siz/. Rhetoric.

1. the suggestion, by deliberately concise treatment of a topic, that much of significance is being omitted, as in “not to mention other faults.”

noun plural -ses (-siːz)

1. a rhetorical device in which an idea is emphasized by the pretence that it is too obvious to discuss, as in there are many drawbacks to your plan, not to mention the cost

n.1580s, from Greek paraleipsis “passing by omission,” from paraleipein “to leave on one side, pass over, leave untold,” from para- “beside” (see para- (1)) + leipein “to leave” (see relinquish).