It means: not very frank.
Related words:
incompletely
[English] [n T kwait][ America] [n t kwa? t]
Incomplete;
bluntly
[English] [? n？ Levl][ America] [ι n i? l？ v？ l]
Honesty/integrity; True/true; Fairly; Frankly speaking;
Example:
Professor Qiu Xigui commented on Cai Wei as follows: He is very keen and has a certain understanding of ancient books. Even some experienced experts can't reach his present level.
The professor commented on Cai Wei in this way: He is very clever and has mastered a lot of knowledge about ancient books, even some experienced experts can't reach his present level.