The definition of sacrosanct is something too important to interfere with or something that must be kept sacred.
The right to liberty is an example of something that would be described as sacrosanct.
very sacred, holy, or inviolable
Origin of sacrosanctClassical Latin sacrosanctus ; from sacer, sacred + sanctus, holy: see saint
Regarded as sacred and inviolable.
Origin of sacrosanctLatin sacrōsānctus, consecrated with religious ceremonies : sacrō, ablative of sacrum, religious rite (from neuter of sacer, sacred; see sacred) + sānctus, past participle of sancīre, to consecrate; see sak- in Indo-European roots.
(comparative more sacrosanct, superlative most sacrosanct)