A hill of beans
Definition 1 of 1
Pro Tip 1/3Cultural Nuance
Understand this phrase is primarily American English and may not be recognized internationally. 
To someone unfamiliar with American idioms, 'a hill of beans' might be confusing.
Pro Tip 2/3Idiomatic Metaphor
Realize it is a metaphor for insignificance, as beans were seen as a humble, common food. 
All his efforts seemed like a hill of beans after the project was cancelled.
Pro Tip 3/3Emotional Context
Used to express a dismissive attitude towards something considered trivial. 
She didn't give a hill of beans for the critics' negative comments.