| impregnability | (noun) having the strength to withstand attack | Synonyms: invulnerability |
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| impregnable | (adjective) capable of conceiving | Synonyms: conceptive |
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| (adjective) immune to attack; incapable of being tampered with | Synonyms: inviolable, secure, strong, unassailable, unattackable |
| (adjective) incapable of being overcome, challenged or refuted | Synonyms: inexpugnable |
| impregnably | (adverb) in an impregnable manner | - |
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| impregnate | (verb) make pregnant | Synonyms: bang up, knock up, prang up |
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| (verb) fertilize and cause to grow | - |
| (verb) infuse or fill completely | Synonyms: saturate |
| (verb) fill, as with a certain quality | Synonyms: infuse, instill, tincture |
| impregnation | (noun) creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant | Synonyms: fecundation, fertilisation, fertilization |
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| (noun) the process of totally saturating something with a substance | Synonyms: saturation |
| (noun) material with which something is impregnated | - |
| nonpregnant | (adjective) not pregnant | - |
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| pregnancy | (noun) the state of being pregnant; the period from conception to birth when a woman carries a developing fetus in her uterus | Synonyms: gestation, maternity |
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| pregnanediol | (noun) a compound found in women's urine during certain phases of the menstrual cycle and in the urine of pregnant women | - |
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| pregnant | (adjective) carrying developing offspring within the body or being about to produce new life | - |
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| (adjective) filled with or attended with | Synonyms: fraught |
| (adjective) rich in significance or implication | Synonyms: meaning, significant |
| unimpregnated | (adjective) not having been fertilized | Synonyms: unfertilised, unfertilized |
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