occasional
adjective
[ əˈkeɪʒ(ə)n(ə)l ]
• occurring, appearing, or done infrequently and irregularly.
• "the occasional car went by but no taxis"
Similar:
infrequent,
intermittent,
irregular,
periodic,
sporadic,
odd,
random,
casual,
desultory,
incidental,
uncommon,
episodic,
few and far between,
fitful,
spasmodic,
isolated,
rare,
sometime,
seldom,
