Impermanent

[im-pur-muh-nuh nt] /ɪmˈpɜr mə nənt/

adjective
1.
not or enduring; transitory.
/ɪmˈpɜːmənənt/
adjective
1.
not permanent; fleeting; transitory
adj.

1650s, from assimilated form of in- “not, opposite of” (see in- (1)) + permanent.

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Impermeability
[im-pur-mee-uh-buh l] /ɪmˈpɜr mi ə bəl/ adjective 1. not permeable; impassable. 2. Chemistry, Geology. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc. /ɪmˈpɜːmɪəbəl/ adjective 1. (of a substance) not allowing the passage of a fluid through interstices; not permeable adj. 1690s, from French imperméable, from Late […]
Impermeable
[im-pur-mee-uh-buh l] /ɪmˈpɜr mi ə bəl/ adjective 1. not permeable; impassable. 2. Chemistry, Geology. (of porous substances, rocks, etc.) not permitting the passage of a fluid through the pores, interstices, etc. /ɪmˈpɜːmɪəbəl/ adjective 1. (of a substance) not allowing the passage of a fluid through interstices; not permeable adj. 1690s, from French imperméable, from Late […]
Impermissible
[im-per-mis-uh-buh l] /ˌɪm pərˈmɪs ə bəl/ adjective 1. not or allowable; unallowable. /ˌɪmpəˈmɪsɪbəl/ adjective 1. not permissible; not allowed adj. 1814, from assimilated form of in- “not, opposite of” (see in- (1)) + permissible.

Impers.
1. . 1. impersonal 2. impersonally
Imperscriptable
adj. “unrecorded, without written authority,” 1832, used only with right. From assimilated form of Latin in- “not, opposite of” (see in- (1)) + perscribere “to write down.”