surest is a form of:

Betimes



adverb
1.
(early or early enough) ទាន់ពេល, មុនពេលកំណត់, តាំងពីចាប់ផ្ដើមដំបូង, ពេលល្អ
ENGLISH MEANING
adverb
1.
In good season or time; before it is late; seasonably; early.
2.
In a short time; soon; speedily; forth with.