Base a.
1. Of little, or less than the usual, height; of low growth; as, base shrubs. [Archaic]
2. Low in place or position. [Obs.]
3. Of humble birth; or low degree; lowly; mean. [Archaic] “A peasant and base swain.”
4. Illegitimate by birth; bastard. [Archaic]
Why bastard? wherefore base? --Shak.
5. Of little comparative value, as metal inferior to gold and silver, the precious metals.
6. Alloyed with inferior metal; debased; as, base coin; base bullion.
7. Morally low. Hence: Low-minded; unworthy; without dignity of sentiment; ignoble; mean; illiberal; menial; as, a base fellow; base motives; base occupations. “A cruel act of a base and a cowardish mind.” --Robynson (More's Utopia). “Base ingratitude.”
8. Not classical or correct. “Base Latin.”
9. Deep or grave in sound; as, the base tone of a violin. [In this sense, commonly written bass.]
10. Law Not held by honorable service; as, a base estate, one held by services not honorable; held by villenage. Such a tenure is called base, or low, and the tenant, a base tenant.
Base fee, formerly, an estate held at the will of the lord; now, a qualified fee. See note under Fee, n., 4.
Base metal. See under Metal.
Syn: -- Dishonorable; worthless; ignoble; low-minded; infamous; sordid; degraded.
Usage: -- Base, Vile, Mean. These words, as expressing moral qualities, are here arranged in the order of their strength, the strongest being placed first. Base marks a high degree of moral turpitude; vile and mean denote, in different degrees, the lack of what is valuable or worthy of esteem. What is base excites our abhorrence; what is vile provokes our disgust or indignation; what is mean awakens contempt. Base is opposed to high-minded; vile, to noble; mean, to liberal or generous. Ingratitude is base; sycophancy is vile; undue compliances are mean.