よく分かりません

The phrase is composed of: - 'よく' (yoku): An adverb meaning 'well', 'properly', 'often'. In this context, it modifies the verb 'wakarimasen' to mean 'not well' or 'not completely'. - '分かりません' (wakarimasen): The negative polite form of the verb '分かる' (wakaru), which means 'to understand' or 'to know'. Combined, 'よく分かりません' literally translates to 'I do not understand well' or 'I do not understand properly', conveying a sense of incomplete understanding rather than a total lack of it. The use of 'yoku' softens the directness of 'wakarimasen', making it a more polite and less abrupt expression.