From ana (in the sense of reversal) and a derivative of skeuos; properly, to pack up (baggage), i.e. (by implication, and figuratively) to upset -- subvert.
KJV: Forasmuch as we have heard, that certain which went out from us have troubled you with words, subverting your souls, saying, Ye must be circumcised, and keep the law: to whom we gave no such commandment:
NASB: "Since we have heard that some of our number to whom we gave no instruction have disturbed you with their words, unsettling your souls,