cause
The bill would require landlords to give tenants 90 days' notice when evicting them out without cause.
Taking antibiotics without cause is a bad practice.
I have had many young patients reporting anxiety, panic attacks, or crying without cause.
I wouldn't tell you without good cause.
Some motorists complained that they had been stopped by the police without any cause.

SMART Vocabulary: related words and phrases

Motives and reasons
autotelic
causeless
drive
first principles
from a place ofidiom
hidden agenda
impulse
inclination
justification
mainspring
motivation
motive
name
object
peg
place
reason
should
wherefores
why