Merriam-Webster's Word of the Day for June 19, 2026 is:

indomitable • \in-DAH-muh-tuh-bul\  • adjective

Indomitable is a formal word used to describe something that is impossible to defeat or discourage.

// Juneteenth celebrates the abolition of slavery in the United States, and honors the indomitable spirit of African Americans past and present fighting for justice, liberation, and the fulfillment of this nation’s ideals.

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Examples:

“During his legendary NBA career, Michael Jordan was renowned not only for his athleticism and skill but also for his indomitable will to win.” – Chicago Tribune, 1 Apr. 2026

Did you know?

At five punchy syllables, indomitable is an imposing word, so it’s inevitable that some are perplexed by this synonym for impregnable. But it’s not so tough once you break it into parts. The prefix in- (spelled im- before b, m, and p) means “not” in an innumerable collection of English words. (How many have you counted so far?) The common suffix -able means “capable of, fit for, or worthy of.” Combine those two English affixes with the Latin verb domitare (“to tame”), and voila: indomitable. Indomitable was first used in English as a synonym of wild, describing—appropriately enough—things that cannot be tamed, but over time the wildness associated with indomitable developed into a specific kind of invulnerable strength.