Soporific

An adjective to describe something that causes or tends to cause sleep.

Mendacious

An adjective to describe when something is not the truth, lying especially habitually.

Braggadocio

Noun to describe boastful or arrogant behaviour.

Carapace

The hard shell on the back of some animals like a turtle or crab

Peccadillo

Noun. A minor sin. Derives from the Spanish word for sin : pecado.

Gregarious

An adjective to someone who is sociable and enjoys the company of others

Prosaic

An adjective to describe when something is lacking in imagination and is dull. When something is characteristic of prose rather than poetry.

Penury

Noun. Extreme poverty

Cognizant/ Cognisant

being aware or having knowledge or perception of something.

Assiduous

An adjective to describe when something is done with constant care and dedication. I am a assiduous reader of this magazine. 

Conflate

To combine or fuse into one entity: be careful to not conflate gossip with real news

Lethargic

An adjective to describe a feeling of abnormal drowsiness and a state of sluggishness: a big meal always makes me feel lethargic

Harrowing

Extremely distressing or agonising: a harrowing experience

Blasé

An adjective to describe when you are indifferent and uninterested to something due to familiarity and frequent exposure.

Esoteric

Something that is intended for to be understood by only a small number of people with a specialised knowledge or interest.

Patois

A regional dialect of a language, usually considered substandard.

Bombastic

Speech or writing this is overly pompous or ostentatiously lofty in style - like this sentence. ;)

Stoical

An adjective that describes someone who endures pain and hardship without showing one's feelings or complaining.

Pragmatic

A adjective to describe someone that takes a realistic approach and has a practical point of view based on practical experience rather than theory.

Dogmatic

An adjective to describe someone who states an unsupported opinion as if it were absolute fact. Originates from dogma, a principal or set of principals that have been laid down by an authority as being incontrovertibly true.