One way to hold this word: something has right outside the line that marks what is normal. There is a standard for how big a problem usually is, or for what people usually do to each other, and this thing is somewhere past it. That is why the word feels heavy in every use — it is always reporting that the ordinary measure no longer fits.
From the word’s history
The source traces enormity through Latin ēnormitās to ēnormis, which is e- (out, away) plus nōrma (a standard or norm). The literal idea is out of the norm, and both modern senses are that same idea pointed in different directions.
字源資料把 enormity 追到拉丁文 ēnormitās，再往前是 ēnormis：e-（出、離開）加上 nōrma（標準、常規）。字面就是「離開了標準」。今天的兩個意思其實是同一個概念指向不同方向：一邊是大小、嚴重程度超出常態，一邊是行為超出做人的界線。這也解釋了為什麼這個字永遠帶著份量。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:707437680:14269): "from Latin ēnormitās ... from ēnōrmis ... derived from e- ... + nōrma (norm, standard)"
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