constant
From LSJ
adj.
Faithful: P. and V. πιστός.
Sure: P. and V. βέβαιος, ἀσφαλής, V. ἔμπεδος; see steadfast.
Unchanging: P. μόνιμος, ἀμετάπτωτος.
Frequent: P. and V. πυκνός, Ar. and P. συχνός.
Continuous: P. συνεχής, ἐνδελεχής.
Incessant: V. διατελής, P. ἄπαυστος.