Bosh is a noun that means something regarded as absurd or nonsense.

Our word of the day is an informal word that comes from the Turkish word for ‘empty’ or ‘worthless.’ It entered the English language in the mid-19th century maintaining the same basic meaning.

Many people find Chris to be a great intellect, but I always thought his book were pure bosh. When you get right down to it, they don’t contain any important substance.