The state of being weak; weakness; feebleness; languor.

the state of being weak or feeble; infirmity

weakness of tonicity in functions or organs of the body

A term referring to a planet being in the sign opposite its rulership (detriment) or in the sign opposite its exaltation (fall). A planet which is in debility is said to express the weaker aspects of the sign. See also Dignity.

A weakened planetary condition, due to unsympathetic aspect, motion, or position. See Dignity.

A planet is weakened when placed in a sign which is unsympathetic to its nature, such as Mercury, an airy planet, when placed in Sagittarius, a fiery sign.