His reply was half-hearted. / She half-heartedly wrote the list.
This word just means to do something without putting your whole heart and soul into it. Like when you have something more important on your mind, or if you don't think you can be passionate about something, you might do it, but only do it half-heartedly. It's an adverb.
He was not committed to the project and gave it a halfhearted effort.
No it's not hyphenated.
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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