Transitory (adjective)
tran·si·to·ry | \ ˈtran(t)-sə-ˌtȯr-ē , ˈtran-zə- \
Definition of transitory
1: of brief duration : TEMPORARY, the transitory nature of earthly joy
2: tending to pass away : not persistent
Unprecedented (adjective)
un·prec·e·dent·ed | \ ˌən-ˈpre-sə-ˌden-təd \
Essential Meaning of unprecedented
1: not done or experienced before. The …