The crystal structure of the title compound, C(12)H(11)NS, features parallel chains of alternating N-H⋯S hydrogen-bonded mirror-image conformers along [10[Formula: see text]]. The mol-ecular conformation is that of an envelope, with all of the framework atoms except one close to a mean plane (rms deviation 0.054 Å); one C atom of the cyclo-hexene-thione ring forms the envelope flap, which makes a dihedral angle of 48.6 (1)° with the rest of the mol-ecule. There is a π-π* inter-action between pairs of enanti-omers in adjacent chains; the distance between parallel planes is 3.466 (1) Å.