To estimate the Moody’s adjusted leverage trend for Terna S.p.A. in 2022, we analyze the changes in debt and operating performance. 

1.  **Debt Profile:** Moody’s adjusted leverage generally looks at Total Debt relative to EBITDA. 
    *   The company's reported "Longterm Borrowings" decreased from 8,835,000,000 EUR to 8,416,700,000 EUR. 
    *   "Shortterm Borrowings" decreased significantly from 1,947,000,000 EUR to 444,100,000 EUR.
    *   While the "Current Portion Of Longterm Borrowings" increased (1,640,000,000 EUR to 1,909,300,000 EUR), the aggregate financial debt (Longterm + Shortterm + Current Portion) shows a reduction from approximately 12.42 billion EUR in 2022 (start of year) to 10.77 billion EUR in 2023 (start of year).

2.  **Operating Performance:**
    *   "Revenue" increased from 2,534,500,000 EUR in 2021 to 2,898,100,000 EUR in 2022.
    *   "Profit Loss From Operating Activities" (Operating Income) increased from 1,200,400,000 EUR in 2021 to 1,333,500,000 EUR in 2022.
    *   EBITDA (approximated by adding Depreciation/Amortization to Operating Income) rose alongside the operating profit, indicating robust cash flow generation.

3.  **Synthesis:** Terna has effectively reduced its gross debt levels while simultaneously increasing its operating income and cash flows. The decline in total debt combined with the growth in operating profitability (EBITDA) indicates that the company's ability to cover its debt obligations has strengthened. Therefore, the credit metrics reflect an improving leverage position.

<answer>Improving</answer>