Antonyms for strengthened

Antonyms of verb strengthen

2 of 3 senses of strengthen

Sense 1:

strengthen, beef up, fortify
Antonym of weaken (Sense 1)
=>weaken

Sense 2:

strengthen
Antonym of weaken (Sense 2)
=>weaken

Antonyms of adj strengthened

1 sense of strengthened

Sense 1:

reinforced, strengthened

INDIRECT (VIA strong) -> weak