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Two independent mol­ecules,  A  and  B , comprise the asymmetric unit of the title compound, C 21 H 18 N 2 OS, with the difference in the angle of orientation between the naphthalene ring system and the mean plane of the cyclo­heptyl ring [16.13 (1) in  A  and 11.48 (5)° in  B ], being evident. The cyclo­heptyl ring adopts a distorted chair conformation in each mol­ecule with r.m.s. deviations of 0.2345 (4) ( A ) and 0.2302 (4) Å ( B ). Intra­molecular O—H⋯N hydrogen bonding generates planar six-membered  S (6) loops with r.m.s. deviations of 0.0099 (1) ( A ) and 0.0286 (1) Å ( B ).

2-[(2-Hydroxynaphthalen-1-yl)methylideneamino]-5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophene-3-carbonitrile