abolutus, -a, -um is an adjective that carries mostly the same senses as the word "absolute".
neuter, -tra, -trum is an adjective that means "neither" and is pretty obviously the source of the English words "neuter", "neutral", and "neutron", among others. "Neutral" in English has developed many meanings so you might have to specify. Do you mean "neutral in charge", "neutral in war", "indifferent" or something else?
flebile nescio quid queritur lyra, flebile lingua murmurat exanimis, respondent flebile ripae