An abortive attempt or action is cut short before it is finished; hence, it is unsuccessful.

An adherent is a supporter or follower of a leader or a cause.

If you are ambivalent about something, you are uncertain whether you like it or what you should do about it.

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

Someone who is capricious changes their mind repeatedly or behaves in unexpected ways; a capricious series of events follows no predictable pattern.

Something that is desultory is done in a way that is unplanned, disorganized, and without direction.

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

When you create a diversion, you cause someone to turn aside momentarily from what they are doing by distracting them.

A dour place is plain and dull—people don’t have much fun there.

If you describe a person, group, or civilization as effete, you mean it is weak, exhausted, powerless, unproductive, and/or corrupt.

Efficacy is the ability or power to produce an expected effect or result.

When people equivocate, they avoid making a clear statement; they are deliberately vague in order to avoid giving a direct answer to a question.

Something that is immutable is always the same and cannot be changed.

Someone who is impetuous does things quickly and rashly without thinking carefully first.

Someone who is impulsive tends to do things without thinking about them ahead of time; therefore, their actions can be unpredictable.

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

Something that happens on an intermittent basis happens in irregular intervals, stopping and starting at unpredictable times.

An intransigent person is stubborn; thus, they refuse to change their ideas or behavior, often in a way that seems unreasonable.

Someone who is irresolute is unable to decide what to do.

A mercurial person’s mind or mood changes often, quickly, and unpredictably.

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.

Someone who is obdurate is stubborn, unreasonable, or uncontrollable; hence, they simply refuse to change their behavior, actions, or beliefs to fit any situation whatsoever.

An obstinate person refuses to change their mind, even when other people think they are being highly unreasonable.

If an object oscillates, it moves repeatedly from one point to another and then back again; if you oscillate between two moods or attitudes, you keep changing from one to the other.

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

If someone has pluck, they have determination and courage.

When you procrastinate, you put off or delay doing something—usually because it is something unpleasant that you’d rather not do.

A propensity is a natural tendency towards a particular behavior.

If someone watches or listens to something with rapt attention, they are so involved with it that they do not notice anything else.

Something or someone that shows resilience is able to recover quickly and easily from unpleasant, difficult, and damaging situations or events.

A restive person is not willing or able to keep still or be patient because they are bored or dissatisfied with something; consequently, they are becoming difficult to control.

A scrupulous person takes great care to do everything in an extremely honest, conscientious, and fair manner.

Someone who is sedulous works hard and performs tasks very carefully and thoroughly, not stopping their work until it is completely accomplished.

If you are steadfast, you have a firm belief in your actions or opinions and refuse to give up or change them because you are certain that you are doing the right thing.

To be tentative is to be hesitant or uncertain about something; an agreement or decision of this kind is likely to have changes before it reaches its final form.

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 someone vacillates, they go back and forth about a choice or opinion, unable to make a firm decision.

Something that is volatile can change easily and vary widely.

If you waver, you cannot decide between two things because you have serious doubts about which choice is better.