ненужные

In a sentence

• На столе лежали ненужные бумаги.

  There were unnecessary papers lying on the table.

  Here, 'ненужные' describes 'бумаги' (papers) as being not required or unnecessary.

• Он выбросил ненужные вещи из кладовки.

  He threw out unnecessary items from the storage room.

  Here, 'ненужные' lists 'вещи' (items) that are no longer needed, indicating lack of usefulness.

• Я стараюсь избегать ненужные траты.

  I try to avoid unnecessary expenses.

  In this sentence, 'ненужные' qualifies 'траты' (expenses), meaning expenditures deemed unnecessary or avoidable.