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Adjektive
servile [ more servile ; most servile]
meek [ meeker ; meekest]
obsequious [ more obsequious ; most obsequious]
submissive [ more submissive ; most submissive]
low {ly}
spiritless {feelings & emotions}
Noun
servility [pl. servilities]
bootlicker [pl. bootlickers]
groveler [pl. grovelers]
spaniel [pl. spaniels]