1.
constantly, always, all the time
Continuously, without interruption.
彼は始終文句を言っている。
He's constantly complaining.
この問題については始終考えている。
I'm constantly thinking about this problem.
2.
from beginning to end, the whole story
The entire process or sequence of events.
始終を話してください。
Please tell me the whole story.
Noun usage: 始終 = the whole sequence of events
事件の始終を警察に説明した。
I explained the whole sequence of events to the police.
彼女は事故の始終を目撃しており、詳しい状況を語ってくれた。
She witnessed the entire incident and told us the detailed circumstances.
会議の始終を記録に残した。
I kept a record of the meeting from start to finish.
TWO USAGES:
1. Adverb: constantly, always
2. Noun: the whole story/sequence (始終を話す = to tell the whole story)
SIMILAR WORDS (adverb meaning):
- いつも - always (most common, neutral)
- 常に - always (more formal)
- 絶えず - incessantly, constantly
- しょっちゅう - frequently (casual)
始終 often has a slightly negative nuance, suggesting something happens too much or annoyingly often.
[Register: Neutral to Slightly Formal]