The word "gnarred" is rare and obscure, and there are few synonyms available. One possible substitute is "knotted," which conveys a similar sense of twisted or contorted shapes. Another option could be "kinked," which suggests a sharp or abrupt bend in a linear object. "Twisted" and "warped" could also be used as synonyms for "gnarred," with both words implying a sense of distortion or irregularity. In general, any term that suggests a lack of smoothness or symmetry could be considered a possible synonym for "gnarred".