13 possible answers to
Answers with 5 characters: EROSE Answers with 6 characters: RAGGED FITFUL SPOTTY UNEVEN Answers with 7 characters: ERRATIC Answers with 8 characters: ABNORMAL ATYPICAL SPORADIC Answers with 9 characters: ANOMALOUS APERIODIC SPASMODIC Answers with 10 characters: INCONSTANT