"strengthened" in the verb sense
1. strengthen, beef up, fortify
make strong or stronger
"This exercise will strengthen your upper body"
"strengthen the relations between the two countries"
2. strengthen
gain strength
"His body strengthened"
3. tone, tone up, strengthen
give a healthy elasticity to
"Let's tone our muscles"
"strengthened" in the adjective sense
1. reinforced, strengthened
given added strength or support
"reinforced concrete contains steel bars or metal netting"
Source: WordNet® (An amazing lexical database of English)
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