“Deterioration” in Japanese
Short answer
Deterioration in Japanese is “劣化” (rekka). Full meaning: deterioration (in quality, performance, etc.), degradation, worsening; (visible) aging, becoming unattractive (due to aging).
Other ways to say “Deterioration” in Japanese
悪化
akka deterioration, getting worse, worsening, aggravation, degeneration, corruption
老廃
rouhai deterioration (due to age), wearing out, expiration
悪変
akuhen deterioration, change for the worse
老朽化
roukyuuka deterioration, becoming decrepit, becoming worn out
腐朽
fukyuu decay, deterioration, rot
増悪
zouaku worsening, deterioration, exacerbation, aggravation (of a disease)
退歩
taiho retrogression, degeneration, deterioration
改悪
kaiaku changing (something) for the worse, disimprovement, deterioration
レベルダウン
reberudaun decrease in level, deterioration, decline
変質
henshitsu alteration (of character or essence), change in quality, transformation, deterioration, degeneration, transmutation; perversion (esp. sexual)
低下
teika fall, decline, lowering, deterioration, degradation
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