What does "indefinable" mean?
Anything that cannot be defined.
adj, noun ·5 syllables ·Moderate ·College level
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"They apparently have a theory that the indefinable psychic gift that they call magic, and which we might designate "psychicism", can be acquired by accosting the soul of a murdered man in a burial ground at midnight."
"It was in mid-summer, when the alchemy of Nature transmutes the sylvan landscape to one vivid and almost homogeneous mass of green; when the senses are well-nigh intoxicated with the surging seas of moist verdure and the subtly indefinable odours of the soil and the vegetation."
Anything that cannot be defined.
Common synonyms include: ineffable, undefinable, aleatoric, aleatory, ambiguous, amorphous.
It was in mid-summer, when the alchemy of Nature transmutes the sylvan landscape to one vivid and almost homogeneous mass of green; when the senses are well-nigh intoxicated with the surging seas of moist verdure and the subtly indefinable odours of the soil and the vegetation.
From in- + definable.