If somebody can't retain things for long in his or her memory and quickly forgets, he or she has a memory like a sieve. A sieve has lots of tiny holes in it to let liquids out while keeping the solids inside.
An sieve idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with sieve, allowing users to choose the best word for their specific context.
Dictionary of similar words, Different wording, Synonyms, Idioms for Idiom, Proverb sieve