The word "fribbled away" means to waste time or to spend time frivolously. Some synonyms for this phrase include idled away, frittered away, squandered, and misspent. All of these words suggest a lack of focus or purposefulness in how time is being spent. Other synonyms for "fribbled away" might include dawdled, loitered, or lingered, which all imply a sense of aimlessness or indecisiveness. Ultimately, the use of any of these synonyms depends on the context in which they are being used and the specific shade of meaning that the writer or speaker wants to convey.