bullish

Etymology

bull + -ish

adj

1. Having a muscular physique, built 'like a bull'
2. Aggressively self-confident or assertive; bullheaded
   He was heavily criticised for his bullish behaviour.
   Sitting on the edge of the stage at the show’s end, draped in a flag and singing You Need Me, a bullish screw-you written when he was 15, he didn’t look much like a man still plagued by nerves over headlining Glastonbury. June 26, 2017, Alexis Petridis, “Glastonbury 2017 verdict: Radiohead, Foo Fighters, Lorde, Stormzy and more”, in the Guardian
3. Optimistic; overly or foolishly optimistic or hopeful
   It [the plan] was bullish about the prospects for BR winning new business and retaining what it had, but recognised that this would depend on the extent to which equipment would enable improved services at lower costs. March 8 2023, David Clough, “The long road that led to Beeching”, in RAIL, number 978, pages 41–42
4. (stock market, of the price of financial instruments) Characterized by rising value.