seasoned
Experienced and very skilled at something from doing it often.
Seasoned describes someone who has gained skill, wisdom, and confidence through lots of experience. A seasoned teacher has taught for many years and knows how to handle tricky situations in the classroom that might fluster a brand-new teacher. A seasoned pilot has flown through storms, dealt with mechanical problems, and logged thousands of hours in the cockpit.
The word means someone has learned from their experiences and become genuinely good at what they do. A seasoned chef understands how flavors work together and can improvise when something goes wrong. A seasoned debater stays calm under pressure because they've faced tough arguments before.
Just as seasoned wood has been prepared and improved over time, a seasoned professional has been shaped and strengthened by experience. You might hear someone say they're waiting for a seasoned expert rather than a beginner when the job really matters.
The word can also mean flavored with spices or salt: seasoned chicken has been prepared with herbs and seasonings to make it taste better.