Calling someone big boned rather than obese is an example of euphemism.
Words can suggest insincerity and avoidance and should not be used to avoid direct talk. Not all words are dishonest as they can sometimes provide valuable protection from harm, but often they dramatically change the meaning of a conversation and prevent clear communication.
Words can be unkind when used to cover up unpleasant or disgruntled ideas or to undermine appropriate attitudes on serious matters. "Speak softly" is an indirect way of saying something that might be rude, unpleasant, or taboo. We use abbreviations to make things sound better or at least, less offensive.
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