Any process that stops, prevents, or reduces the frequency, rate or extent of GABAergic synaptic transmission, the process of communication from a neuron to another neuron across a synapse using the neurotransmitter gamma-aminobutyric acid (GABA). (Gene Ontology, GO_0032229)
7 genes participating in the negative regulation of synaptic transmission, gabaergic biological process from the curated GO Biological Process Annotations dataset.