Lazy
In its soul, a narwhal that's supposed to do construction under the moon, will be too lazy to do it. And when your soul is lazy, there's no way you'll be able to get something done.
Picture the lazy narwhal laying on a block of ice in the moonlight. There are tools and other blocks of ice around, but he just can't seem to get up and do any construction work.
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You can't tell the lazy narwhal he's being lazy because he's your dad (だ). If he was anyone else you'd tell him off for being lazy, but you can't tell off your dad. That's just not right.
Picture your lazy dad. Your big, lazy narwhal dad.