What are the opposite words for weaken?

The antonyms for the word "weaken" are words that denote strength or power. Some of these antonyms include words such as fortify, reinforce, strengthen, bolster, invigorate, and buttress. These antonyms suggest the opposite of weakening, emphasizing the idea of building up, adding to, or enhancing something. For instance, to fortify means to strengthen something, such as a wall or a defense system. Reinforce suggests the adding of more signs of support for something that already exists. These antonyms demonstrate that when it comes to expressions of strength and power, there is a whole range of words that signify the opposite of weakening.

Antonym of the day

johnny come lately
expert, local, national.