形容词

1. 断断续续的;间歇性的
Something that is fitful happens for irregular periods of time or occurs at irregular times, rather than being continuous.

1. intermittently stopping and starting

e.g. fitful (or interrupted) sleep
off-and-on static

Synonym: interruptedoff-and-on(a)

2. occurring in spells and often abruptly

e.g. fitful bursts of energy
spasmodic rifle fire

Synonym: spasmodic