1. Occurring without interruption; chiefly restricted to what recurs regularly or frequently in a prolonged and closely spaced series
   "the continual banging of the shutters" 
2. 'continual' (meaning seemingly uninterrupted) is often used interchangeably with 'continuous' (meaning without interruption)

See also: continually, continuous, insistent, perennial, persistent, recurrent, recurring, relentless, repeated, repetitive, revenant, running, uninterrupted, unrelenting

Antonym: sporadic

• one-liner
• one-man
• one-man rule
• one-member
• one-millionth
• one-night stand
• one-ninth
• one-off
• one-on-one
• one-party
• one-person
• one-piece
• one-quadrillionth
• one-quarter
• one-quintillionth
• one-seed
• one-seeded
• one-seventh
• one-sided
• one-sidedly
• one-sidedness
• one-sixteenth
• one-sixth
• one-sixtieth
• one-sixty-fourth