ことなしに
- 1Without doing X; describes an action or state that occurs with X absent (e.g., 彼は挨拶することなしに部屋を出た).
- 2Unless X is done, Y is impossible; the main clause is negative or expresses impossibility, framing X as a prerequisite.Ex. 1
- 3Used to insist that a desired outcome cannot be reached without the effort or step X.Ex. 2
Main clause: negative or impossibility expression for the prerequisite reading (〜できない, 〜はずがない), affirmative for plain 'without doing'（部屋を出た）
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A stiff, written expression found in essays, speeches, and opinion pieces. It is most typical in statements of principle such as 'without X, Y cannot happen', but it can also simply describe acting without doing something. It is more formal than ずに and ないで, and it leans more toward the prerequisite reading than ことなく does.
Do not attach ことなしに directly to a noun; with nouns, use なしに or なくして instead (努力なしに).
Note that the 'Y is impossible without X' reading needs a negative or impossibility main clause; with an affirmative clause it simply means 'without doing'.
Learners should avoid ことなしに in casual conversation, where ずに or ないで sounds natural.
- なしにN2「なしに」attaches to nouns, while 「ことなしに」attaches to verbs in dictionary form, and their meanings largely correspond. 「なしに」is neutral in register and used even in formal speech, whereas 「ことなしに」is more written and stiff; e.g. 「努力することなしに」≈「努力なしに」.
- ことなくN2「ことなく」emphasizes that something never happened or was never done, often with 「一度も」. It can also pair with a negative second clause to mean 'cannot be achieved without doing,' but 「ことなしに」is more typical for that use; for the simple 'without doing' meaning, the two are similar.
- 〜ないことにはN3「〜ないことには」attaches to the ない-form (and also to adjectives and nouns) and works in both spoken and written language. It only covers the 'cannot be achieved without doing' meaning, where it is roughly interchangeable but with a softer tone; it cannot express the simple 'without doing' meaning.
- なくしてN1「なくして」attaches directly to nouns (e.g. 「努力なくして」), and for actions you use 「ことなくして」. It only corresponds to the 'cannot be achieved without doing' sense of 「ことなしに」, with the second clause usually negative or impossible, and cannot express the simple 'without doing' meaning.
- ずにN3「ずに」attaches to the ない-form (する→せずに) and can describe everyday concrete actions, while 「ことなしに」takes the dictionary form, is more formal, and usually pairs with a negative second clause to state a principle. For stating principles the two are interchangeable, but 「ことなしに」is unsuitable for everyday trivial actions.
なしに and なくして attach to nouns, and なくして is even more literary. ことなく is the usual neutral written 'without doing', 〜ないことには marks a necessary condition in a more conversational way, and ずに is the plain everyday 'without doing' attached to the ない-stem.
