余り

1. Origins, structure, and basic meaning

• Structure: 余り, read あまり, can name a remainder or indicate a limited degree with a negative expression.
• Basic usage: The examples use it for leftover material and for evaluating how spicy a dish is.

2. Common pitfalls and similar expressions

• A noun for what remains
  • The example's 余りの布 means leftover fabric. This noun use does not require a following negative form.
• With a negative form
  • The example's 余り辛くなかった means it was not very spicy. Do not strengthen it to not spicy at all.