The antonyms for the word "rounding-off" can vary depending on the context of its usage. For instance, if it refers to the mathematical term, the antonyms can be "exactness," "precision," or "accuracy," indicating the opposite of the approximation that takes place in rounding off numbers. On the other hand, if it represents the completion of a task or activity, the antonyms can be "incomplete," "unfinished," or "partial," indicating the opposite of finishing off a project or activity. Therefore, the antonyms for "rounding-off" can differ according to the meaning and context of its utilization.