You can use either. Weird is probably a bit 'weirder' than strange! ;) As a note - you should say 'in a sentence'. You should only use 'the' when you are talking about one specific sentence. Here, you are asking in general terms, so you should use 'a'. I don't like that teacher. He looks at the girls in a weird way / He looks at the boys in a strange way. There is a strange light in the sky. There is a weird light in the sky. I just heard a really weird sound. I just heard a really strange sound.