Not given enough credit, praise, or recognition; considered less good or important than it actually is.
From prefix 'under-' (below, less than) combined with 'rated' (evaluated), creating the sense of being evaluated too low.
Many underrated movies only become classics decades later when people discover them—like 'The Shawshank Redemption' was a box office flop but is now considered one of the greatest films ever!
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