When an adjective is used to describe an action, a verb, it becomes an adverb and is added a -ly. And so, these two sentences should be correct:

It was an intended act.

I intendedly did it.

Now, the word ill-intended basically refers to something being done with bad/malicious intent, with an evil motive. Can I use the same grammar on this word - can the word ill-intended directly replace intended in a sentence?

It was an ill-intended act.

I ill-intendedly did it.

I can't find descriptions and definitions of ill-intendedly when searching, but it seems to be a proper sentence. What is your view on this?

  • 1
    “I did it with ill intent” is perhaps the more common way that I would think to say this. – Fogmeister Dec 29 '19 at 13:02
  • "Maliciously" is a perfectly good word meaning with ill intent. – the-baby-is-you Dec 30 '19 at 4:18

Because participles can play a role as adjectives, they can be formed into adverbs.


is an example that is used with fair frequency. However, the formation of adverbs from perfect participles seems to be rare; what is far more common is the formation of adverbs from present participles. I have no explanation for this; it is simply a personal observation.


may be grammatical, but it certainly is neither idiomatic nor euphonious. For one thing, "intentionally" forms an equivalent adverb to "intendedly" without forming an adverb from a perfect participle. For another "ill-intended" is a compound of adverb and adjective using an adverb that is very odd in having identical adjectival and adverbial forms.

I think I would say

I did it with ill intent

using an adverbial phrase rather than a weird adverb.

  • From what you are saying, is it correctly understood that ill-intendedly is not strictly wrong, but not commonly (never) used? – Steeven Dec 29 '19 at 16:26
  • I have never heard it or seen it used. In that sense, it is not idiomatic. It does not, as far as I can see, violate any rule on forming words in English. Because there are alternatives to this non-idiomatic word, I'd recommend avoiding it completely. – Jeff Morrow Dec 30 '19 at 0:47

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