Zonked means completely wiped out — so tired that you cannot move, cannot think, and do not want to do a single thing. It is stronger than 'tired' and stronger than 'sleepy'. Picture someone coming home after a twelve-hour shift, dropping onto the sofa, still in their shoes, and not getting up again. That is zonked. The same word also describes someone dazed by drugs or by strong medicine — heavy, slow, only half-awake. Which meaning you get depends entirely on the situation. 'The baby's zonked' obviously means fast asleep. 'He came in zonked' could go either way, and the listener will decide from what they already know about the person. This is casual, spoken slang, and it leans a little older — you hear it from parents and grandparents more than from teenagers. Speakers often add 'out': 'zonked out'. It is not rude and not offensive, just relaxed. Do not put it in an email to your boss; do say it to a friend. Grammar: it is an adjective. Use it after 'be' or a similar verb — 'I'm zonked', 'she looks zonked', 'he seemed zonked'. Putting it before a noun ('a zonked man') is possible but sounds odd; native speakers rarely do it.

累癱了、累到動不了（口語）。比 tired 重很多，是那種倒在沙發上完全不想動的程度；有時也指被藥物或安眠藥弄得昏昏沉沉。屬於輕鬆的口語，正式場合別用。