Antonyms

Persistence means continuing firmly in a course of action despite difficulty or opposition. Inconstancy refers to lack of stability or consistency, making it the direct opposite. The other options (inequality, irrelevance, incompetence, intemperance) do not contrast with the concept of steadfastness.

In the context of physics or wave behavior, to reflect means to bounce back off a surface. To absorb means to take in completely, which is the direct opposite behavior. When light or sound hits a surface, it can either reflect or be absorbed - these are mutually opposite outcomes.

Abdicate means to formally give up or renounce a throne, power, or responsibility. Usurp means to seize or take power wrongfully or by force, often without legal right. These represent opposite actions - one voluntarily gives up power, the other takes it aggressively.

Luminous means emitting or reflecting light, bright, or shining. Dark is the direct opposite, describing something with little or no light. This is a straightforward antonym pair commonly used in descriptive language.

Accelerate means to increase speed or cause something to move faster. Retard means to delay, slow down, or impede progress. These are direct opposites in the context of motion, speed, or development.

Rectitude means moral correctness, righteousness, or virtue in conduct. Immorality is the direct opposite, referring to behavior that violates moral principles. The other options (pessimism, agility, indignation) are unrelated to moral character.

Acquit means to formally declare someone not guilty of a crime or to free someone from a charge. Convict means to formally declare someone guilty, which is the direct opposite in legal proceedings. The other options (sentence, perjure, arrest, disclose) are related to law but not antonyms.

Perennial means lasting for a long time, enduring, or recurring regularly (often used for plants that live for multiple years). Fleeting means lasting for a very short time or ephemeral. These represent contrasting durations of time.

Dormancy refers to a state of inactivity, rest, or suspended animation (like seeds in winter or hibernating animals). Activity means the state of being active, energetic, or in motion. These are direct opposites describing the state of motion or operation.

Mute means silent, unable or unwilling to speak, or lacking sound. Amplify means to make louder or increase the volume of sound. These are opposites in the context of sound - one suppresses or lacks sound, the other enhances it.

Vulnerable means exposed to harm, danger, or risk, easily hurt or attacked. Safe means protected from danger, harm, or risk. These are direct opposites describing security and exposure to threat.

Advocate means to publicly support, recommend, or defend a cause or person. Denounce means to publicly declare to be wrong or evil, to condemn or criticize openly. These represent opposite stances - one supports, the other condemns.

Mandatory means required, compulsory, or obligatory. Its opposite is optional, which means something is voluntary or left to choice. Viable, humane, punitive, and legal are not antonyms of mandatory.

Adulterate means to make impure or inferior by adding foreign substances. Its opposite is purify, which means to remove impurities or make something pure. Contain, stabilize, compress, and lubricate are unrelated to purity.

Fringe refers to the outer edge, border, or periphery of something. Its opposite is center, which represents the core or middle position. Proximity, breadth, outlet, and continuity are not antonyms of fringe.