Hyperfine

[Ernesto]

[Hyperfine] refers to someone who, when asked how they are/how they feel, always says that they’re fine even if they’re not.

When someone uses the phrase, “[I’m fine].” continuously to the point that their answer is [predictable], they would be considered [hyperfine].

[Mendocky]

extremely fine or thin, as in a spectral line split into two or more components