The word "most capillaceous" is used to describe something or someone that has or consists of fine, hair-like structures or filaments. Synonyms for this term include "most delicate," "most slender," "most gossamer," "most wispy," "most feathery," "most lacy," "most sheer," "most ethereal," "most filmy," and "most tenuous." Each of these words describes a similar characteristic of something being thin, light, or fragile in nature. "Most capillaceous" is a unique term, but there are numerous synonyms that can be used to convey the same message depending on the context of the conversation or writing.