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Definitions

strengthen

[strengk-thuhn, streng-, stren-] / ˈstrɛŋk θən, ˈstrɛŋ-, ˈstrɛn- /
VERB
make more forceful, powerful
Synonyms
STRONGEST
bolster build up enhance enlarge establish extend heighten increase intensify invigorate reinforce restore set up step up support sustain toughen
STRONG
add anneal ascend brace buttress confirm corroborate empower fortify harden justify mount multiply regenerate rejuvenate renew rise steel substantiate temper tone wax
WEAK
add fuel to fire make firm sinew tone up
Antonyms
STRONGEST
abridge condense curtail decrease destroy diminish halt hinder lessen let down lower reduce shrink slow subtract undermine weaken
STRONG
contradict decline deny descend disprove drop fall kill reject ruin slump soften
WEAK
break down discourage dishearten dissuade hurt
VERB
encourage, hearten
Synonyms
STRONGEST
consolidate invigorate restore toughen uphold
STRONG
animate back bloom brace burgeon cheer embolden enliven flourish flower fortify gird harden inspirit nerve nourish prepare prosper rally ready refresh rejuvenate steel substantiate temper thrive
WEAK
back up bear out brace up carry weight enhearten gather resources give weight
Antonyms
STRONG
discourage dishearten dissuade fail kill languish let go lose neglect ruin shrink shrivel soften weaken
WEAK
break down hurt

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"Our study show that a simple dietary nutrient could complement and strengthen advanced cancer treatments like immunotherapy."

From Science Daily • Apr. 10, 2026

In announcing the change, Trump said it would help strengthen national security and public safety.

From BBC • Apr. 9, 2026

Spending relative to GDP reflects the societal sacrifices to strengthen defense, and last year Poland, Lithuania, Latvia, Estonia, Denmark and Norway spent a larger share than the U.S.

From The Wall Street Journal • Apr. 7, 2026

It said a task force involving the police, tourist board and aviation officials would "strengthen oversight and conduct regular audits", as well as to ensure guides and trekking agencies were licensed.

From Barron's • Apr. 7, 2026

We tracked down her sisters and arranged a visit where Trina could see her son, and it seemed to strengthen her in ways I wouldn't have thought possible.

From "Just Mercy" by Bryan Stevenson

Vocabulary lists containing strengthen

President Obama's second inaugural address

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Spelling Practice, Unit 2

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