0 not worried or not interested, especially when you should be worried or interested: --
The baby was apparently unconcerned by the noise.
Are you as unconcerned about the situation as you seem to be?
How can you be unconcerned about how much things cost?
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Можем да го завършим стъпка по стъпка, колкото и дълъг да е пътят и не може да бъде завършен, колкото и кратък да е пътят, ако дори не маркирате отпечатъка си.