"utterest" in the adjective sense
1. arrant, complete, consummate, double-dyed, everlasting, gross, perfect, pure, sodding, stark, staring, thorough, thoroughgoing, utter, unadulterated
without qualification used informally as (often pejorative) intensifiers
"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 thorough nuisance"
"a thoroughgoing villain"
"utter nonsense"
"the unadulterated truth"
2. blank, utter
complete and absolute
"utter seriousness"
"blank stupidity"
Source: WordNet® (An amazing lexical database of English)
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