Obsolete means outdated or no longer in use. Modern is its direct antonym, meaning current or up-to-date.

Benevolent means kind and generous. Malicious means evil or harmful, making it the opposite.

Verbose means using more words than necessary. Concise means brief and to the point, which is opposite.

Ephemeral means lasting a very short time. Permanent means lasting indefinitely, making it the antonym.

Prolific means producing much fruit, foliage, or many offspring; fertile and productive. Barren is the opposite.

Vigorous means forceful and energetic. Weak, sluggish, and lethargic all represent opposite meanings.

Abscond means to leave secretly. Surrender, meaning to give oneself up, is the nearest antonym.

Candid means frank and honest. Evasive means avoiding direct answers, making it the antonym.

Disparate means fundamentally different or incompatible. Similar is its direct antonym.

Augment means to make greater in size or extent. Reduce means to make smaller, which is opposite.