fu·ga·cious /fyuˈgeɪʃəs/

1. fleeting; transitory: a sensational story with but a fugacious claim on the public’s attention.
2. Botany . falling or fading early.

1625–35; < L fugāci– (s. of fugāx apt to flee, fleet, deriv. of fugere to flee + -ous

—Related forms
fu·ga·cious·ly, adverb
fu·ga·cious·ness, fu·gac·i·ty  /fyuˈgæsɪti/, noun

Source: Dictionary.com.

No doubt as to that! Cugel displayed a remarkable hole, but Duke Orbal disallowed it on grounds of fugacity.

Source: Tales of the Dying Earth by Jack Vance.