ETYM Old Eng. continuel, French continuel. Related to Continue.
1. 'continual' (meaning seemingly uninterrupted) is often used interchangeably with 'continuous' (meaning without interruption).
2. Seemingly without interruption; chiefly restricted to what recurs regularly or frequently in a prolonged and closely spaced series.
ETYM Old Eng. perpetuel, French perpétuel, from Latin perpetualis, from perpetuus continuing throughout, continuous, from perpes, -etis, lasting throughout.
Never ceasing; continuing forever or for an unlimited time; unfailing; everlasting; continuous.