non-sibilant UK /nɒnˈsɪb.ɪ.lənt/US /nɑnˈsɪb.ɪ.lənt/adjective 1noun 1forms 1 adjective1 •Not sibilant; not having the characteristics of a sibilant consonant. noun1 •A non-sibilant consonant. formsnon-sibilants