劣勢【れっせい】
inferiority (e.g. numerical), inferior position, disadvantage, unfavorable situation, unfavourable situation
劣悪【れつあく】
inferior, coarse, poor quality, inadequate, deteriorated
卑劣【ひれつ】
mean, contemptible, despicable, dirty, foul, cowardly, base
優劣【ゆうれつ】
(relative) merits, superiority or inferiority, quality
劣る【おとる】
to be inferior to, to be less good at, to fall behind
劣等感【れっとうかん】
inferiority complex, sense of inferiority
拙劣【せつれつ】
clumsy, unskillful