what does it mean by "at its most adj"

i have trouble understanding the preposition phrase "at its most adj" because its meaning is not on any dictionary;
can someone please help me understand the meaning of that phrase ?

the sentence I don't understand:
"At its most radical, moralism produces descriptions of ideal political societies knwon as Utopias"
does that phrase mean "At moralism's most radical level? part? degree? "
it seems like the adjective "radical" is missing a noun which should come next

other usage can be found, too

He has seen it at its most challenged, and at its most communal.

At its most boring, it's network monitoring.

It's microeconomics at its most microscopic.

It's journalism at its most pitiful level

It was music at its most infectious.