This event caused the body to release endorphins.
Believe it or not, hot sauces can be mildly addictive as they release endorphins in the brain.
This justifies the use of this word, in a sentence.
A psychopath is a person who lacks empathy, exhibits manipulative behavior, and often engages in antisocial or criminal activities without feeling guilt or remorse.
The word "ingenuous" would be used in a sentence like the word primitive. A example would be: "He told the truth because he was ingenuous." It can be also used for the phrase "ingenuous question".
Tangible is a word used to describe something that you can see and touch. A sentence using this word would be, she would not have believed it if it was not tangible.
Alfalfa is a type of wheat, I think, so it would be used in a sentence as a noun.
If it were used in a sentence it would be easier to answer.
she jumped about playfully.
I would be more apt to use it if I understood how it is used.
If this were used in a sentence it would be possible to answer your question.
people were used for slavery
The word convivial is not typically used in a sentence. However, if one is interested in using this word, it is usually used in settings related to good company.