As the others have stated above, they are more or less interchangeable. However, "weird", though not informal, is less formal than the other two. So, if you are speaking with friends for instance, any of the three will do; in a piece of writing however, it would be better to use "odd" or "strange". When used as an adverb however, such as "oddly" or "weirdly" as an example, sometimes one is more appropriate than the other, purely based on the sound of the sentence (as opposed to grammar). I illustrate this point with the below examples: 1. "Oddly enough, I was just thinking this exact same question." - appropriate 2. "Strangely enough, I was just thinking this exact same question." - appropriate. 3. "Weirdly enough, I was just thinking this exact same question." - sounds a little weird. 1. "People have been acting weirdly around me today." - appropriate 2. "People have been acting strangely around me today." - appropriate 3. "People have been acting oddly around me today." - does not sound as good as the other two. ======= ======= Some synonyms you may appreciate (purely for the benefit of your vocabulary): Uncanny; peculiar; anomalous; bizarre... There are plenty to choose from! Indeed, English is a curious language :-D

I would not have guessed at a bias of one or any other for people versus inanimate objects. Ignore him. He's a little odd like that. . If anything, I think I'd use weird maybe less for people, prefering to call them odd or strange. But not a lot in it. . Odd means not normal. Which is pretty close to the others.

Thank you for your comment Aaron.

Hello, I am a native English speaker. The terms can be used fairly interchangeably. For instance if something falls from a shelf, seemingly on its own volition, you could describe it as “odd”, “strange”, or “weird”. There is no correct answer, it’s personal preference. There may be a case where one is more appropriate, but I can’t think of one.