fastidious
used in In Cold Blood

only 1 use

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Definition

giving careful attention to detail

or:

excessively concerned with cleanliness or matters of taste

Both, for example, were fastidious, very attentive to hygiene and the condition of their fingernails.
1 — Last To See Them Alive (39% in)

fastidious = excessively concerned with cleanliness

There are no more uses of "fastidious" in In Cold Blood.

Typical Usage (best examples)