"abstractest" in the adjective sense
1. abstract
existing only in the mind separated from embodiment
"abstract words like `truth' and `justice'"
2. abstract, abstractionist, nonfigurative, nonobjective
not representing or imitating external reality or the objects of nature
"a large abstract painting"
3. abstract
dealing with a subject in the abstract without practical purpose or intention
"abstract reasoning"
"abstract science"
Source: WordNet® (An amazing lexical database of English)
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