"sourest" in the adjective sense
1. sour, rancid
smelling of fermentation or staleness
2. sour
having a sharp biting taste
3. sour
one of the four basic taste sensations like the taste of vinegar or lemons
4. off, sour, turned
in an unpalatable state
"sour milk"
5. false, off-key, sour
inaccurate in pitch
"a false (or sour) note"
"her singing was off key"
6. dark, dour, glowering, glum, moody, morose, saturnine, sour, sullen
showing a brooding ill humor
"a dark scowl"
"the proverbially dour New England Puritan"
"a glum, hopeless shrug"
"he sat in moody silence"
"a morose and unsociable manner"
"a saturnine, almost misanthropic young genius"- Bruce Bliven
"a sour temper"
"a sullen crowd"
Source: WordNet® (An amazing lexical database of English)
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