improved

adj

1. That has been made better; enhanced.

   “The second is to develop a new generation of further improved contrast agent that can yield more intense myocardial contrast after intravenous injection.”

   “"When we're finished in 2024, this upgrade programme will provide a much-improved railway between London Waterloo and Portsmouth," said NR's Wessex Route Director Mark Killick.”

verb

1. (form-of, participle, past)simple past and past participle of improve