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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.

Being short USD/JPY means investors are betting that the dollar will fall in value against the yen, or that the yen will strengthen against the greenback.

From MarketWatch • May 2, 2026

She says she’s running to ramp up housing production, revive the entertainment industry and strengthen city services.

From Los Angeles Times • May 1, 2026

Wildcat Resources should be on the radar of investors as lithium tailwinds strengthen, says Euroz Hartleys.

From The Wall Street Journal • May 1, 2026

“Your participation will strengthen our collective ability to restore freedom of navigation and protect the global economy,” the cable reads.

From The Wall Street Journal • Apr. 29, 2026

And they said: ‘Surely that is one of the great steeds of the King of Rohan? Maybe the Rohirrim will come soon to strengthen us.’

From "The Return of the King" by J.R.R. Tolkien

Vocabulary lists containing strengthen

President Obama's second inaugural address

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Spelling Practice, Unit 2

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