It is incorrect to use the words continuous and continual interchangeably because there is a difference between them.

Comparison chart

Continually versus Continuously comparison chart
Edit this comparison chartContinuallyContinuously
Meaning For a certain duration, on and off but with interruptions For a certain duration, uninterrupted

Main Difference in Meaning

While both adjectives describe duration, continuous indicates duration without interruption. For example, The continuous humming of the fluorescent lights gave him a headache.

Continual indicates duration that continues over a long period of time, but with intervals of interruption. For example, The continual street repair disrupted traffic for nearly two years.

The distinction between adverbs continuously and continually follows the same pattern. For example,

Video Explaining the Differences

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"Continually vs Continuously." Diffen.com. Diffen LLC, n.d. Web. 27 Apr 2016. < >