If you do something with alacrity, you do it eagerly and quickly.

Apathy is a lack of interest or unenthusiastic involvement in an activity; there is no effort to change or improve it at all.

When you have ardor for something, you have an intense feeling of love, excitement, and admiration for it.

An assiduous person works hard to ensure that something is done properly and completely.

The adjective blithe indicates that someone does something casually or in a carefree fashion without much concern for the end result; as a result, they are happy and lighthearted.

When you cavort, you jump and dance around in a playful, excited, or physically lively way.

If something moves or grows with celerity, it does so rapidly.

When someone is conscientious in performing a task, they do it in a thorough and careful fashion to make sure that it is completely done.

Someone or something that is dilatory is slow and causes delay.

When you are diligent in completing a task, you work hard or tirelessly at it until it is complete.

Someone does something in a disinterested way when they have no personal involvement or attachment to the action.

Someone who is ebullient is filled with enthusiasm, very happy, and extremely excited about something.

An effervescent individual is lively, very happy, and enthusiastic.

Someone who is exacting expects others to work very hard and carefully.

Something that is extemporaneous, such as an action, speech, or performance, is done without any preparation or practice beforehand.

Someone who is fastidious cares excessively about small details and wants to keep everything correct, tidy, very clean, and in perfect order.

Someone who is feckless is incompetent and lacks the determination or skill to achieve much of anything at all in life.

An impromptu speech is unplanned or spontaneous—it has not been practiced in any way beforehand.

If someone is indefatigable, they never show signs of getting tired.

An indolent person is lazy.

Someone who is ineffectual at a task is useless or ineffective when attempting to do it.

Insouciance is a lack of concern or worry for something that should be shown more careful attention or consideration.

Something kinetic is moving, active, and using energy.

If you do something in a lackadaisical way, you do it carelessly and without putting much effort into it—thereby showing that you are not really interested in what you’re doing.

A languid person is slow, relaxed, and shows little energy or interest in doing anything.

If you are lethargic, you are tired, lack energy, and are unwilling to exert effort.

When you are listless, you lack energy and interest and are unwilling to exert any effort.

Someone is considered meticulous when they act with careful attention to detail.

A negligent person does not complete what they say they will do; they are careless and not attentive to their work.

If you are oblivious to something that is happening, you do not notice it.

If someone is pedantic, they give too much importance to unimportant details and formal rules.

Someone who is pertinacious is determined to continue doing something rather than giving up—even when it gets very difficult.

To be punctilious is to pay precise attention to detail.

When you have been remiss, you have been careless because you did not do something that you should have done.

A tenacious person does not quit until they finish what they’ve started.

If your body is affected by torpor, you are severely lacking in energy; therefore, you are idle—and can even be numb.

If you are unflagging while doing a task, you are untiring when working upon it and do not stop until it is finished.

If you are unrelenting in your desire to do something, you stop at nothing until you’ve done it.

A thing or person that is unremitting is persistent and enduring in what is being done.

When you have a vehement feeling about something, you feel very strongly or intensely about it.

A wastrel is a lazy person who wastes time and money.

Someone who is zealous spends a lot of time, energy, and effort to support something— notably that of a political or religious nature—because they believe in it very strongly.