musing (n.)youdaoicibaDictYouDict[musing 词源字典]
late 14c., "complaint," verbal noun from muse (v.). Meaning "pondering" is from mid-15c. Related: Musingly; musings.[musing etymology, musing origin, 英语词源]
ponder (v.)youdaoicibaDictYouDict
early 14c., "to estimate the worth of, to appraise," from Old French ponderer "to weigh, poise" (14c., Modern French pondérer) and directly from Latin ponderare "ponder, consider, reflect," literally "to weigh," from pondus (genitive ponderis) "weigh" (see pound (n.1)). Meaning "to weigh a matter mentally" is attested from late 14c. Related: Pondered; pondering; ponderation.