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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.

Microsoft plans to invest $10 billion in Japan over four years to develop AI infrastructure and strengthen cybersecurity.

From The Wall Street Journal • Apr. 3, 2026

This new crisis will again strengthen the resolve of European countries and Canada to bolster their own defences and depend on themselves for their own security.

From BBC • Apr. 1, 2026

This deal would strengthen McCormick’s condiments and flavorings portfolio while expanding its North American retail and distribution footprint, said Alex Torgerson, M&A partner at consulting firm West Monroe.

From Barron's • Mar. 31, 2026

These tube-like materials can strengthen polymers and metals or guide the movement of ions in batteries and desalination systems with far less resistance.

From Science Daily • Mar. 31, 2026

We had long suspected a clamp-down was coming, and the Congress decided that certain members needed to leave the country to strengthen the organization abroad in anticipation of the time it would be banned entirely.

From "Long Walk to Freedom" by Nelson Mandela

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.