Antonyms of verb weaken

2 of 5 senses of weaken

Sense 1
weaken -- (lessen the strength of; "The fever weakened his body")
       Antonym of strengthen (Sense 1)
      => strengthen, beef up, fortify -- (make strong or stronger; "This exercise will strengthen your upper body"; "strengthen the relations between the two countries")

Sense 2
weaken -- (become weaker; "The prisoner's resistance weakened after seven days")
       Antonym of strengthen (Sense 2)
      => strengthen -- (gain strength; "His body strengthened")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb weaken

5 senses of weaken

Sense 1
weaken -- (lessen the strength of; "The fever weakened his body")
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")

Sense 2
weaken -- (become weaker; "The prisoner's resistance weakened after seven days")
       => decrease, diminish, lessen, fall -- (decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper")

Sense 3
sabotage, undermine, countermine, counteract, subvert, weaken -- (destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war")
       => disobey -- (refuse to go along with; refuse to follow; be disobedient; "He disobeyed his supervisor and was fired")

Sense 4
de-escalate, weaken, step down -- (reduce the level or intensity or size or scope of; "de-escalate a crisis")
       => decrease, lessen, minify -- (make smaller; "He decreased his staff")

Sense 5
dampen, damp, soften, weaken, break -- (lessen in force or effect; "soften a shock"; "break a fall")
       => deaden, blunt -- (make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation; "Terror blunted her feelings"; "deaden a sound")

Antonyms of adj weakened

5 senses of weakened

Sense 1
diminished, lessened, vitiated, weakened -- (impaired by diminution)

INDIRECT (VIA impaired) -> unimpaired -- (not damaged or diminished in any respect; "his speech remained unimpaired")

Sense 2
weakened -- (made weak or weaker)

INDIRECT (VIA weak) -> strong -- (having strength or power greater than average or expected; "a strong radio signal"; "strong medicine"; "a strong man")

Sense 3
attenuate, attenuated, faded, weakened -- (reduced in strength; "the faded tones of an old recording")

INDIRECT (VIA decreased) -> increased -- (made greater in size or amount or degree)

Sense 4
cut, thinned, weakened -- (mixed with water; "sold cut whiskey"; "a cup of thinned soup")

INDIRECT (VIA diluted) -> undiluted -- (not diluted; "undiluted milk"; "an undiluted racial strain")

Sense 5
hurt, weakened -- (damaged inanimate objects or their value)

INDIRECT (VIA damaged) -> undamaged -- (not harmed or spoiled; sound)

Similarity of adj weakened

5 senses of weakened

Sense 1
diminished, lessened, vitiated, weakened -- (impaired by diminution)
       => impaired (vs. unimpaired) -- (diminished in strength, quality, or utility; "impaired eyesight")

Sense 2
weakened -- (made weak or weaker)
       => weak (vs. strong) -- (wanting in physical strength; "a weak pillar")

Sense 3
attenuate, attenuated, faded, weakened -- (reduced in strength; "the faded tones of an old recording")
       => decreased (vs. increased), reduced -- (made less in size or amount or degree)

Sense 4
cut, thinned, weakened -- (mixed with water; "sold cut whiskey"; "a cup of thinned soup")
       => diluted (vs. undiluted), dilute -- (reduced in strength or concentration or quality or purity; "diluted alcohol"; "a dilute solution"; "dilute acetic acid")

Sense 5
hurt, weakened -- (damaged inanimate objects or their value)
       => damaged (vs. undamaged) -- (harmed or injured or spoiled; "I won't buy damaged goods"; "the storm left a wake of badly damaged buildings")