base 2 
(bās)
(bās)adj. bas·er, bas·est
1. Having or showing a lack of decency; contemptible, mean-spirited, or selfish.
2.
a. Being a metal that is of little value.
b. Containing such metals: base coins.
3. Archaic Of low birth, rank, or position.
4. Obsolete Short in stature.
n.
Obsolete
Obsolete
A bass singer or voice.
[Middle English bas, low, from Old French, from Medieval Latin bassus.]
basely adv.
baseness n.
Synonyms: base2, low1, abject, ignoble, mean2, sordid
These adjectives mean lacking in dignity or falling short of the standards befitting humans. Base suggests a contemptible, mean-spirited, or selfish lack of human decency: "that liberal obedience, without which your army would be a base rabble" (Edmund Burke).
Something low violates standards of morality, ethics, or propriety: low cunning; a low trick. Abject means degrading or miserable: abject failure; abject poverty. Ignoble means lacking noble qualities, such as elevated moral character: "For my part I think it a less evil that some criminals should escape than that the government should play an ignoble part" (Oliver Wendell Holmes, Jr.)
Mean suggests pettiness, spite, or stinginess: "Never ascribe to an opponent motives meaner than your own" (J.M. Barrie).
Sordid suggests foul, repulsive degradation: "It is through art ... that we can shield ourselves from the sordid perils of actual existence" (Oscar Wilde).
These adjectives mean lacking in dignity or falling short of the standards befitting humans. Base suggests a contemptible, mean-spirited, or selfish lack of human decency: "that liberal obedience, without which your army would be a base rabble" (Edmund Burke).
Something low violates standards of morality, ethics, or propriety: low cunning; a low trick. Abject means degrading or miserable: abject failure; abject poverty. Ignoble means lacking noble qualities, such as elevated moral character: "For my part I think it a less evil that some criminals should escape than that the government should play an ignoble part" (Oliver Wendell Holmes, Jr.)
Mean suggests pettiness, spite, or stinginess: "Never ascribe to an opponent motives meaner than your own" (J.M. Barrie).
Sordid suggests foul, repulsive degradation: "It is through art ... that we can shield ourselves from the sordid perils of actual existence" (Oscar Wilde).