not very, not much
Expresses that something is not done much, or something is not very (adjective), often implying less than expected.
あまり~ない is a common pattern used to say 'not very' or 'not much.' It softens a negative statement, implying that something is less than expected or desired. For example, with verbs it means you don't do something often or much, and with adjectives it means something is not very good, big, etc.
This pattern is used in everyday conversation and is neutral in politeness. You can make it more polite by using あまり~ません for verbs, but the basic form is fine for casual speech. Note that you must use a negative verb or adjective after あまり; you cannot use a positive form.
Word order is flexible: you can say あまり食べない or テレビはあまり見ない, but あまり must precede the negated predicate.