1. continual (vs. sporadic), insistent, repetitive, running(prenominal), perennial, recurrent, repeated, persistent, relentless, unrelenting, recurring, revenant

usage: 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, continuous (vs. discontinuous), uninterrupted

usage: `continual' (meaning seemingly uninterrupted) is often used interchangeably with `continuous' (meaning without interruption)

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See also: continual (Dictionary)