Data quality is an assessment of data's fitness to serve its purpose. You can enable gibberish words module to perform the quality check on open-ended questions against the gibberish responses.
Consider that your survey asks the respondents to enter their comments/suggestions. If the respondents enter gibberish text ("xxxxxxx", "asfn") which doesn't make any sense, then such responses will be flagged.
This feature is available with the following license :