1
it is heartening to do sth
此句型中 it 为形式主语，真正的主语是不定式短语。
It is heartening to see so many people volunteering.
看到这么多人做志愿者，真是令人振奋。
鼓舞人心的；令人振奋的
先理解核心含义，再看它在真实句子里的用法。
鼓舞人心的；令人振奋的
heartening
It is heartening to see so many people volunteering.
看到这么多人做志愿者，真是令人振奋。
令人鼓舞的
Cheerfully encouraging.
令人鼓舞的
cheerfully encouraging
It was heartening to see so many volunteers helping at the shelter.
看到这么多志愿者在收容所帮忙，真是令人振奋。
The team's progress in the last month has been very heartening for everyone.
团队上个月的进展让所有人都感到非常鼓舞。
We received heartening news that the missing child was found safe.
我们收到了令人振奋的消息，失踪的孩子平安找到了。
此句型中 it 为形式主语，真正的主语是不定式短语。
It is heartening to see so many people volunteering.
看到这么多人做志愿者，真是令人振奋。
that 从句说明令人振奋的具体内容，口语中 that 常省略。
It is heartening that the project has received wide support.
这个项目得到了广泛支持，真是令人鼓舞。
find 后接宾语和形容词补足语，表示“觉得……令人振奋”。
Many students found the teacher's encouragement heartening.
许多学生觉得老师的鼓励令人振奋。
Not this
I felt very heartening after hearing the good news.
Use this
I felt very heartened after hearing the good news.
heartening 是现在分词形容词，意为“令人振奋的”，修饰使人受到鼓舞的事物；表示人自己“感到振奋”时，要用过去分词形容词 heartened。句子的主语 I 是感受者，因此应说 I felt heartened，而不是 I felt heartening。
Not this
Please accept my heartening thanks for your support.
Use this
Please accept my heartfelt thanks for your support.
heartening 表示“令人振奋的、鼓舞人心的”，heartfelt 表示“衷心的、真诚的”。“衷心的感谢”是固定搭配 heartfelt thanks，不能用 heartening。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
令人振奋的消息
The team received heartening news about the project's future.
团队收到了关于项目前景的令人振奋的消息。
令人鼓舞的迹象
There are heartening signs that the economy is recovering.
有令人鼓舞的迹象表明经济正在复苏。
令人鼓舞的进展
We have made heartening progress in reducing poverty.
我们在减少贫困方面取得了令人鼓舞的进展。
令人振奋的事态发展
This is a heartening development for everyone involved.
对所有参与者来说，这是令人振奋的事态发展。
令人鼓舞的回应
The charity received a heartening response to its appeal.
该慈善机构的呼吁得到了令人鼓舞的回应。
看到……令人鼓舞
It is heartening to see so many young people volunteering.
看到这么多年轻人做志愿者，令人鼓舞。
Use heartening naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 heart（心）和“心”联系起来：-en 表示“使”，事情使人心头一热、充满力量，就是 heartening（鼓舞人心的）。
语域：neutral 常见场景：news reports、formal writing、everyday conversation heartening 通常用于书面语和正式场合，如新闻报道或演讲，表示“让人感到鼓舞、振奋”；在日常口语中也能使用，但不算特别随意。
与 heartening /ˈhɑrtənɪŋ/ 真正押韵的是 smartening /ˈsmɑrtənɪŋ/（重读元音和后续音相同）。hardening /ˈhɑrdənɪŋ/、frightening /ˈfraɪtənɪŋ/、threatening /ˈθrɛtənɪŋ/、listening /ˈlɪsənɪŋ/、brightening /ˈbraɪtənɪŋ/ 拼写相似但发音不同，不押韵。
Dictionary facts from ECDICT, WIKTIONARY.