most important of all

[嘟嘟嘟嘟]

Most important of all, I think, is that we should be interested in it.


Since "most" here is used to form the superlative, why is there no "the" for the underlined part? Thanks!

 

[tedmc]

The phrase is an adverb, not an adjective.

Most importantly (of all), I think we should...
The most important factor of all is that we should...

not a teacher

 

[MikeNewYork]

"Most important" works just fine.