Sabbath (Biblical seventh day)

a promise / an appointment or social engagement (the meeting itself) / a convention; something that is conventional / something that is preordained

well-versed in usages or practices of the court or military households

quickness, rapidity

speculation, conjecture, guesswork

excursion, school trip

measurement

If one learns without thinking, one will be lost in his learning. That is, if one does not think about what one learns, he will not arrive at the truth of it.

irregularity, unsteady, disorderly

(figuratively) volatile, critical, dangerous, touch-and-go