It is easier — even quicker, once you have the habit — to say In my opinion it is not an unjustifiable assumption that than to say I think. If you use ready-made phrases, you not only don’t have to hunt about for the words; you also don’t have to bother with the rhythms of your sentences since these phrases are generally so arranged as to be more or less euphonious.
politics And The English Languageby george Orwell
The great enemy of clear language is insincerity. When there is a gap between one’s real and one’s declared aims, one turns as it were instinctively to long words and exhausted idioms, like a cuttlefish squirting out ink.
What is above all needed is to let the meaning choose the word, and not the other way about. In prose, the worst thing you can do with words is to surrender them.
Other words used in variable meanings, in most cases more or less dishonestly, are: class, totalitarian, science, progressive, reactionary, bourgeois, equality.
bourgeois / equality / progressive / science / totalitarian
Political language – and with variations this is true of all political parties, from Conservatives to Anarchists – is designed to make lies sound truthful and murder respectable, and to give an appearance of solidity to pure wind.