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LingakuLingakuThe grammar structure ことだし is used to present a reason or justification for a decision, action, or suggestion. It translates roughly to "since," "because," or "seeing as" in English. It carries a nuance of offering a natural or obvious reason that supports a course of action – often one that the speaker is about to propose or has already decided on.
ことだし attaches to the plain form of verbs, adjectives, and nouns:
ことだし is softer and more conversational than から or ので. It often implies that the reason being given is one among potentially several, and that it tips the balance toward a particular conclusion. The し at the end reinforces this "among other things" nuance, similar to how 〜～し lists reasons.
Because of this, ことだし frequently appears in sentences where the speaker is making a suggestion, proposing a plan, or justifying a decision – rather than simply stating a cause-and-effect relationship.
While 〜～し on its own can list multiple reasons casually, ことだし wraps the preceding clause into a more cohesive reason and often appears with expressions like せっかく (since we've gone to the trouble) or もう (already). It tends to sound slightly more deliberate in presenting the reason.
In this last pattern, ～のことだし refers to what the speaker knows about a person, expressing confidence or expectation based on their nature.