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Physically transient resistive switching devices, a form of memory devices with the ability of achieving physical disappearance in a controllable manner, hold tremendous potentials in multiple security applications. Herein, we demonstrated a physically transient form of memristive device composed of Ag/polyvinyl alcohol/W with configurable resistive switching functionality for security neuromorphic computing. The resistive switching type of the transient device could be modulated effectively by controlling the compliance current during the set process, which was well interpreted by the filament model. Typical synaptic functions pertained to short-term plasticity (STP) and its transition from STP to long-term plasticity were vividly mimicked in this transient memristive device. Importantly, both the synaptic functions and physical form of the transient devices were capable of disappearing instantly upon immersing in de-ionized water, and the dissolution characteristics of the constituent transient materials were investigated experimentally to reveal the degradation mechanism of the device. This transient form of artificial synapse provides foreseeing perspectives on information security enhancement for neuromorphic computing systems. [ABSTRACT FROM AUTHOR]