Given without an equivalent or recompense; conferred without valuable consideration; granted without pay, or without claim or merit; not required by justice.
source: Webster 1913
adjective satellite
without cause
A gratuitous insult.
source: WordNet 3.0
costing nothing
Complimentary tickets. Free admission.
source: WordNet 3.0
unnecessary and unwarranted
A strikers' tent camp...was burned with needless loss of life.
