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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.

Spanish Prime Minister Pedro Sanchez called China's trade imbalance with the European Union "unsustainable" on Monday, as he began a three-day visit to Beijing where he hopes to strengthen economic ties.

From Barron's • Apr. 12, 2026

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

From Science Daily • Apr. 10, 2026

OpenAI said when announcing its UK data centre project in September it would help strengthen the UK's "sovereign compute capabilities" and bolster its native AI development.

From BBC • Apr. 9, 2026

He has repeatedly promised Israelis he is using their undoubted power and ingenuity to reshape the Middle East in a way that will strengthen their country.

From BBC • Apr. 9, 2026

I nearly suffocated in my vapor bath while trying to strengthen my lungs prior to deployment.

From "Salt to the Sea" by Ruta Sepetys

Vocabulary lists containing strengthen

President Obama's second inaugural address

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Spelling Practice, Unit 2

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