based on custom rather than documentation; "an unwritten law"; "rites...so ancient that they well might have had their unwritten origins in Aurignacian times"- J.L.T.C.Spence
articulate (a consonant) with the tongue curled back against the palate; "Indian accents can be characterized by the fact that speakers retroflex their consonants"
excessive or irrational devotion to some activity; "made a fetish of cleanliness"
a form of sexual desire in which gratification depends to an abnormal degree on some object or item of clothing or part of the body; "common male fetishes are breasts, legs, hair, shoes, and underwear"