To be angry is to experience strong feelings of displeasure. To be indignant is to feel deep anger at something considered unjust or offensive. Indignation is righteous anger, or anger that is morally justified. Someone who is indignant perceives insult or injury to their own or someone else's dignity. The term carries traces of scorn and contempt, and sometimes implies sanctimonious disdain. This range in meaning helps to explain why you might see indignant with a modifier, such as rightly indignant, justly indignant, and genuinely indignant. 

A group is a collection or assemblage of persons or things. When that number is on the larger side, the group may be called a bevy. Bevy's earliest use in English is as a collective noun for quail (behold, the bevy of quail!), similar to a covey of partridges. When in reference to people, bevy has historically described groups of women. While you will still encounter these specific uses, the word bevy has resisted being pigeonholed. The term is now widely used in a general sense to emphasize abundance in number, and can be found in reference to just about any type of assemblage or collection.

To explain is to make clear something that is not known or understood. A parent might explain to a disbelieving child why they cannot have ice cream for dinner (no nutritional value!). To expound is to give a methodical, detailed, scholarly explanation of something. It is a more elaborate action, with a slightly performative or presentational sense. A professor might expound theories, doctrines, or philosophies with lengthy verbosity. Legal experts might expound a law, and religious scholars might expound Scripture. But we also find  it used humorously on occasion, in a slightly teasing or self-deprecating manner. While the use of expound with a preposition, as in expound on or expound upon, has some critics, pairings such as these have become increasingly common and are sure to be understood just fine.

To hope for something is to desire it with only some expectation that it will happen. It conveys a feeling of longing or wishfulness. The verb aspire nudges desire toward action, implying an eagerness and drive to make it so. The work that goes into making an aspiration real may even leave you breathless. After all, aspire comes from the Latin verb aspīrāre "to breathe upon" or "to pant after." Consider the lofty aspirations of the dog who pants after the squirrel; much like Fido, when we aspire to something, we are working to attain it.

Something that is fun provides enjoyment or amusement. Something that is convivial is friendly and agreeable, or festive. Convivial is a warm and social term; it's most often used to talk about gatherings of people who are in high spirits and enjoying one another's company, often sharing in a meal or refreshments. Its gregarious nature makes sense given its origin: convivial comes from the Latin noun convīvium meaning "feast," which derives from the verb convīvere "to live together, to dine together." When describing a person, convivial means "merry company, jovial." Convivial is good company any time of year, but given its appetite for feasting and gathering, it's no wonder we hear convivial a little more around the holidays!

To improve something is to make it better or bring it into a more desirable condition. Ameliorate shares this broad sense, but this formal verb is typically used to discuss circumstances that are more dire than what you might find with improve. For instance, you may hear of improving a workflow, or improving sound quality, but it is less likely that you'll hear ameliorate used in everyday contexts such as these. More commonly, you'll find ameliorate in discussion of oppressive, unjust, or difficult conditions, such as those brought by social or economic inequality or environmental degradation.

When a task or duty is so difficult to perform that doing so feels like a burden, it may be best described as onerous. Onerous comes from the Latin word for "burden," onus, which is used in English with the same meaning. A burden is something that is oppressively heavy, and indeed, when we use the word onerous, we evoke the idea of heaviness: an onerous undertaking is one so riddled or "heavy" with hardships it is difficult to bear. Onerous is also used to describe agreements, contracts, or guidelines that are so bogged down with legal obligations or restrictions, the intended benefits or advantages are outweighed.