fitful

形容词 fitful:

1. occurring in spells and often abruptly
   同义词：spasmodic
2. intermittently stopping and starting
   同义词：interrupted, off-and-on

1. I worried half the night and have a fitful sleep.
   我半个晚上都一直在担心，故而时醒时睡。
2. Characterized by fitful, jerky movements.
   跳跃的，跳动的：具有一阵阵的跳动的特征的

fit.ful

adj.（形容词）
Occurring in or characterized by intermittent bursts, as of activity; irregular.See Synonyms at periodic
间歇的，不规则的：以间歇性阵发为特征的或阵发性活动的；不规则的参见 periodic

【引伸】
fit.fully
adv.（副词）
fit.fulness
n.（名词）