As a proper noun holiday

is .

As an adjective undefined is

lacking a definition or value.

As a noun propylene

is propylene.

As an adjective undefined is

lacking a definition or value.

As adjectives the difference between indifferentiable and undefined

is that indifferentiable is unable to be differentiated while undefined is lacking a definition or value.

As a proper noun merit

is .

As an adjective undefined is

lacking a definition or value.

As a noun commentator

is a person who comments; especially someone who is paid to give his/her opinions in the media about current affairs, sports, etc.

As an adjective undefined is

lacking a definition or value.

As a noun gravel

is (uncountable) small fragments of rock, used for laying on the beds of roads and railroads, and as ballast.

As a verb gravel

is to apply a layer of gravel to the surface of a road, etc.

As an adjective undefined is

lacking a definition or value.

As a verb practised

is (practise).

As an adjective undefined is

lacking a definition or value.

As a noun seal

is sea, air, land (used as a name of a military unit).

As adjectives the difference between extravagant and undefined

is that extravagant is exceeding the bounds of something; roving; hence, foreign while undefined is lacking a definition or value.

As a noun participation

is the act or process of participating.

As an adjective undefined is

lacking a definition or value.