Then there is the correspondent whose descriptions are too vague;

too general--little more than bald assertions
Then there is the correspondent whose descriptions are too vague;
too general--little more than bald assertions. A letter from a
vacuum cleaner manufacturing company trying to interest agents is
filled with such statements as: 'This is the best hand power machine
ever manufactured,' 'It is the greatest seller ever produced,' 'It
sells instantly upon demonstration.' No one believes such
exaggerations as these. Near the end of the letter--where the writer
should be putting in his clincher, there is a little specific
information stating that the device weighs only five pounds, is made
of good material and can be operated by a child. If this paragraph
had followed quickly after the introduction and had gone into
further details, the prospect might have been interested, but it is
probable that the majority of those who received the letter never
read as far as the bottom of the second page.