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handwritten + noun
handwritten 常作定语形容词，放在名词前，表示“手写的”。
She sent me a handwritten letter.
她给我寄来一封手写的信。
手写的
先理解核心含义，再看它在真实句子里的用法。
手写的
written by hand
She sent me a handwritten letter.
她给我寄来一封手写的信。
用手书写的,而非打印的。
Written with a person's hand, as opposed to typed.
This handwritten letter from my grandmother is my most treasured possession.
我祖母的这封手写信是我最珍贵的财产。
The invitation was handwritten, so it felt more personal.
请柬是手写的，所以感觉更有人情味。
I can't read his handwritten address on the package.
我认不出包裹上他手写的地址。
handwritten 常作定语形容词，放在名词前，表示“手写的”。
She sent me a handwritten letter.
她给我寄来一封手写的信。
也可作表语，说明事物是手写的。
The invitation was handwritten.
那份请柬是手写的。
需要说明书写者时，用 by 引出。
The note is handwritten by the author.
这张便条是作者手写的。
Not this
This is a handwriting letter.
Use this
This is a handwritten letter.
handwriting 是名词，意为“笔迹/书写”，不能直接修饰名词；应使用形容词 handwritten（手写的）作定语。
Not this
The address must be handwrite.
Use this
The address must be handwritten.
be 动词后应接形容词或过去分词作表语；handwrite 是动词原形，应改为 handwritten（手写的）。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
手写信
She sent me a handwritten letter from Paris.
她从巴黎给我寄来一封手写信。
手写便条
He left a handwritten note on the kitchen table.
他在厨房桌上留了一张手写便条。
手写原稿
The library owns the author's handwritten manuscript.
图书馆收藏了作者的手写原稿。
手写签名
Please provide your handwritten signature at the bottom.
请在底部提供你的手写签名。
手写文件
The clerk scanned the handwritten document into the system.
职员将手写文件扫描进了系统。
Use handwritten naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
拆分记忆：hand（手）+ written（写下的）＝手写的，如 handwritten letter 亲笔信。
语域：neutral 常见场景：notes and letters、forms and documents、signatures handwritten 是中性词，正式与非正式场合都常用；多用于说明某内容是手写的，而不是打印或电子输入的。
Written, unwritten and rewritten share the final segment /rɪtən/ with handwritten, but they stress that syllable, while handwritten stresses 'hand'. They are not true rhymes with handwritten. Handwriting looks similar at the start but ends in /raɪtɪŋ/, so be careful not to confuse its sound with handwritten's /rɪtən/ ending.
Dictionary facts from ECDICT, WIKTIONARY.