1 suddenly

2 all of a sudden

1 to neglect

2 to overlook

3 to ignore

1 now hot, now cold

2 (of one's mood, affection etc) to alternate

1 fleeting (of quick passage time)

2 in a flash

3 distracted manner

4 vacantly

5 frustratedly

1 to rock

2 to sway

3 to flicker (e.g. of lights reflected on water)

4 to flutter (e.g. of a flag)

5 to trick sb into doing sth

6 to dupe

7 to con

1 to accumulate tiny quantities (idiom)

1 to drift without a resting place (idiom)

2 roving

3 errant

4 vagrant

5 erratic