dandy

Concise Oxford English Dictionary © 2008 Oxford University Press:
dandy/ˈdandi/

▶noun (pl. dandies)

• 1 a man unduly concerned with a stylish and fashionable appearance.

• 2 informal, dated an excellent thing of its kind.

▶adjective (dandier, dandiest) N. Amer. informal excellent.

– derivatives
dandiacal /danˈdʌɪək(ə)l/ adjective (dated or humorous),
dandyish adjective,
dandyism noun.

– origin C18: perh. a shortened form of C17 Jack-a-dandy ‘conceited fellow’ (Dandy was a familiar form of the given name Andrew).