That's not true. There's lot of cases of particularly charged words in certain languages lacking a direct emotional analog in others. See http://news.bbc.co.uk/2/hi/africa/3830521.stm for one example; Russian has many like this, too. There's even languages that aren't "complete" in the semantic sense; see: http://www.newyorker.com/reporting/2007/04/16/070416fa_fact_...