1. 未掺杂的;纯的
Something that is unadulterated is completely pure and has had nothing added to it.

2. （常用于强调不好的品质）十足的，纯粹的，地道的
You can also use unadulterated to emphasize a particular quality, often a bad quality.

1. without qualification
used informally as (often pejorative) intensifiers

e.g. an arrant fool
a complete coward
a consummate fool
a double-dyed villain
gross negligence
a perfect idiot
pure folly
what a sodding mess
stark staring mad
a thoroughgoing villain
utter nonsense
the unadulterated truth

Synonym: arrant(a)complete(a)consummate(a)double-dyed(a)everlasting(a)gross(a)perfect(a)pure(a)sodding(a)stark(a)staring(a)thoroughgoing(a)utter(a)

2. not mixed with impurities

e.g. unadulterated maple syrup