positive adj.
1 certain
VERBS be, seem, sound
ADV. absolutely, quite I'm absolutely positive it was him. | fairly
PREP. about She seemed fairly positive about it. | of Are you positive of your facts?
2 hopeful and confident/encouraging
VERBS appear, be, feel, seem, sound | remain
ADV. distinctly, extremely, highly, overwhelmingly, really, very He took a highly positive view of the matter. | entirely, wholly | fairly, mildly, moderately, quite | broadly, essentially, generally | apparently, seemingly
PREP. about sounding very positive about his chances
3 showing that sth has happened/is present
VERBS be, prove, test The test proved positive.
ADV. strongly, weakly (both technical)
PREP. for He tested positive for HIV.
You can also check other dicts: positive (English, 中文解释 ), wordnet sense, Collins Definition