Indefinably

[in-di-fahy-nuh-buh l] /ˌɪn dɪˈfaɪ nə bəl/

adjective
1.
not definable; not readily identified, described, analyzed, or determined.
noun
2.
something that cannot be defined:
the indefinables of great musicianship.
/ˌɪndɪˈfaɪnəbəl/
adjective
1.
incapable of being defined or analysed: there was an indefinable sense of terror
adj.

1810, from in- (1) “not, opposite of” + definable (see define). Related: Indefinably.

Read Also:

Indefinite
[in-def-uh-nit] /ɪnˈdɛf ə nɪt/ adjective 1. not definite; without fixed or specified limit; unlimited: an indefinite number. 2. not clearly defined or determined; not precise or exact: an indefinite boundary; an indefinite date in the future. 3. Grammar. 4. Botany. /ɪnˈdɛfɪnɪt/ adjective 1. not certain or determined; unsettled 2. without exact limits; indeterminate: an indefinite […]
Indefinite-article
noun, Grammar. 1. an article, as English a, an, that denotes class membership of the noun it modifies without particularizing it. noun 1. (grammar) a determiner that expresses nonspecificity of reference, such as a, an, or some Compare definite article The word a or an introducing an unspecified noun or the name of a general […]
Indefinite-integral
noun, Mathematics. 1. a representation, usually in symbolic form, of any function whose derivative is a given function. noun 1. (maths) indefinite integral (ĭn-děf’ə-nĭt) A function whose derivative is a given function.

Indefinitely
[in-def-uh-nit] /ɪnˈdɛf ə nɪt/ adjective 1. not definite; without fixed or specified limit; unlimited: an indefinite number. 2. not clearly defined or determined; not precise or exact: an indefinite boundary; an indefinite date in the future. 3. Grammar. 4. Botany. /ɪnˈdɛfɪnɪtlɪ/ adverb 1. without any limit of time or number /ɪnˈdɛfɪnɪt/ adjective 1. not certain […]
Indefiniteness
[in-def-uh-nit] /ɪnˈdɛf ə nɪt/ adjective 1. not definite; without fixed or specified limit; unlimited: an indefinite number. 2. not clearly defined or determined; not precise or exact: an indefinite boundary; an indefinite date in the future. 3. Grammar. 4. Botany. /ɪnˈdɛfɪnɪt/ adjective 1. not certain or determined; unsettled 2. without exact limits; indeterminate: an indefinite […]