WordNet: weakening

becoming weaker

• hypernym shift, transformation, transmutation

• hyponym debilitation, enervation, enfeeblement, exhaustion

• hyponym atrophy, withering

• hyponym attenuation, fading

• hyponym downfall, fall

• hyponym loosening, relaxation, slackening

weakening

• (englanti) strengthening (antonym)

• (englanti) weaken (derivationally related)
• (suomi) heikentyminen (synonyymi)