One picture you can hold for unforgiving: a door that closes after a single mistake and does not open again. The mistake may be small, and it may be old, but nothing gives way afterwards. Whatever is holding that door shut — a person, a desert, a — the shape of the picture is the same: it does not let you off.
unforgiving 可以想成一扇「錯一次就關上、而且不會再打開」的門。犯的錯也許很小，也許是很久以前的事，但那扇門就是不鬆手。把門關住的可以是一個人，也可以是一片沙漠、一份行程表。畫面都一樣：它不放過你，也不給第二次機會。
From the word’s history
At the level of its parts the word is simply un- plus forgiving, the -ing form of forgive, so its literal value is not forgiving.
從構詞看，這個字就是 un-（不）加上 forgiving（會原諒的），而 forgiving 來自 forgive。字面價值就是「不原諒」，其他用法都可以掛在這個字面意思上理解。
Wiktionary entry supplied in this packet: un- + forgiving (source_ref kaikki:3f6f69a190036ae4:1431070144:8275)
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