#let:p

[5wordsaday]

pejorative (adj.)

having a disparaging, derogatory, or belittling effect or force

[5wordsaday]

pneumonoultramicroscopicsilicovolcanoconiosis (n.)

an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language

There are a number of very long words in the medical and science fields, and we don't want to add words strictly from that arena. But, the longest one in that field is pneumonoultramicroscopicsilicovolcanoconiosis (that’s forty-five characters), which is the manufactured name of an occupational lung disease (more commonly known as silicosis) resulting from inhaling crystalline silica dust).

Some discount this one from the record books, stating it is an "artificial" word that was reportedly coined (or created) for the purpose of being the longest word in an official dictionary, back in 1935. But, it's still in the dictionary today so we're including it! (source)

[5wordsaday]

pervicacious (adj.)

extremely willful; obstinate; stubborn

[5wordsaday]

perspicuous (adj.)

clearly expressed or presented; lucid

[5wordsaday]

precipitous (adj.)

of the nature of or characterized by precipices; extremely or impassably steep

[5wordsaday]

polemic (n.)

a controversial argument, as one against some opinion, doctrine, etc; a person who argues in opposition to another; controversialist

[5wordsaday]

purloin (v.)

verb (used with object)

to take dishonestly; steal; filch; pilfer.

verb (used without object)

to commit theft; steal.

[5wordsaday]

penurious (adj.)

extremely stingy, parsimonious, miserly; extremely poor, destitute, indigent; poorly or inadequately supplied, lacking in means or resources