aposiopetic

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ap·o·si·o·pe·sis

A0371500 (ăp′ə-sī′ə-pē′sĭs)n. pl. ap·o·si·o·pe·ses (-sēz) A sudden breaking off of a thought in the middle of a sentence, as though the speaker were unwilling or unable to continue.
[Late Latin aposiōpēsis, from Greek, from aposiōpān, to become silent : apo-, intensive pref.; see apo- + siōpān, to be silent (from siōpē, silence).]
ap′o·si′o·pet′ic (-pĕt′ĭk) adj.
Thesaurus
Adj.1.aposiopetic - relating to or characteristic of aposiopesis