Unflappable (adjective)

Not easily upset or excited; calm and collected in difficult situations.

Origin:

Mid 19th century: from un- (expressing negation) + flappable.

Examples:

1. The unflappable air traffic controller remained calm and composed even during the emergency landing.
2. The unflappable chess player remained focused and in control, even when faced with a difficult opponent.
3. The unflappable nature of the politician inspired confidence and trust in the public.
4. The unflappable manner of the doctor reassured the patients, who felt safe in her care.
5. The unflappable demeanor of the detective was a result of years of experience, enabling her to solve the case.