1

I think it is grammatically correct to say She is not happier than her sister but, with the adverb less, I should say She is not less happy than her sister.

1) She is not less happy than her sister.

2) She is not less happier than her sister.

Which of the two is correct? Could you help me clarify it? Thank you always.

  • 2
    I don't think you should use 'not less', in the first place. It sounds awkward. – Varun Nair Jan 30 '18 at 11:26
  • In 2) do you mean less happier or happier? – Drossel Jan 30 '18 at 11:36
  • #2 is simply ungrammatical - "happier" is exactly equivalent to "more happy", and She is not less more happy than me is just nonsense. And although #1 is syntactically valid, it's awkward, as @Varun Nair says. The natural and obvious way to express the idea is to throw out the unnecessary and distracting "double negation" - She is as happy as her sister. – FumbleFingers Reinstate Monica Jan 30 '18 at 13:17
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That really depends on what you want to say. If you are talking about what should be combined with "less" (and only with "less"), it's "happy", not "happier". However, there is a construction where "no less" (mind you, not "not less") is combined with []-er. For example,

no less happier than the rest of us

This has a connotation of "in no way unhappier"—there is a hint of an emphasis there.

But if you are just aiming at comparing them, your sentences do sound a bit clumsy, and the best way to say it is,

She is just as happy as her sister.

1

Do you remember how to form the superlative and comparative forms of adjectives in English? Here's a quick reminder for you:

  • happy, difficult (positive form, e.g.: "He is happy.", "The problem is very difficult.")
  • happier, more difficult (comparative form; used to compare things, e.g.: "He is happier than her.", "This problem is more difficult than that one.")
  • happiest, most difficult (superlative form; think super or the best, e.g.: "He is the happiest person in the world.", "The Willis Tower is the tallest building in Chicago.", "This is the most difficult problem in mathematics of all time.")

As you may have noticed, there are essentially two ways to form comparatives and superlatives in English. One-syllable and two-syllable words like big, happy etc. follow the first pattern: happy, happier, happiest. Words that are longer than two syllables use the second pattern: difficult, more difficult, most difficult (while more happy, strictly speaking, is not grammatically correct, a lot of people do say it anyway).

And how do you do the opposite of that? In other words, how do you form the negative comparative and negative superlative forms of adjectives? Well, you use the following pattern which is the same for all adjectives regardless of how many syllables they contain:

  • happy, difficult
  • less happy, less difficult
  • least happy, least difficult

From that we can conclude that the construction less happier actually makes no sense because, for all intents and purposes, it simply does not exist in English. Think about what you're doing. You are combining the positive comparative form of happy which is happier with the first part of its negative comparative form which is less. That's why of the two, only your first sentence is grammatically correct while the second one is not. And not less happy than makes perfect sense in the following context:

Is she less happy than her sister? No, she is not less happy than her sister. On the contrary, she is as happy as her sister. (In other words, both sisters have the same level of happiness)

-1

She is not less happy than her sister sounds just as clumsy as She is not less happier than her sister. I recommend that you use an antonym instead of happy.

She is not unhappier than her sister.

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