筈(はず)がないHardly possible, Cannot be, Highly unlikely, Improbable

The Japanese phrase はずだ conveys expectation, such as when something should be a certain way or when a person should be able to do something. On the other hand, はずがない signifies something highly unlikely or improbable, as though saying 'there's no way this can be.' While the former expresses hope or assumption, the latter emphasizes disbelief or denial regarding a situation or event.

The phrase はずがない is used when something is seen as hardly possible or highly unlikely to happen, expressing a strong sense of disbelief or denial about something. On the other hand, わけだ is used when explaining or concluding a reason or cause, implying a sense of understanding or realization about why something is a certain way, such as 'no wonder' or 'naturally'.

"はずがない" and "ないことはない" are both used to describe the likelihood of something happening, but carry different nuances. "はずがない" is stronger and denotes that something is highly unlikely to happen or even impossible, almost completely ruling out the possibility. On the other hand, "ないことはない" admits that while something may be unlikely or not the norm, it is not entirely impossible and could conceivably happen.

The phrase ことはない emphasizes that there is no necessity or requirement for a certain action or that something never happens. It's often used in an advisory tone. On the other hand, はずがない implies that something is almost impossible or highly unlikely to occur, often expressing disbelief or denying a possibility. It is more about expressing strong conviction about improbability of an event or situation.

The phrase "はずがない" is often used to express strong conviction that something is not possible or likely to happen based on the information one currently has. It is often used when expressing disbelief or surprise that something is not as it should be. On the other hand, "わけではない" is a phrase used to refute or negate a certain assumption, presumption, or implication that has been made. It allows for the acknowledgement of some truth or part thereof, while denying the general or total assumption.

The phrase はずがない is often used when the speaker has some sort of expectation or logical basis for believing that something won't happen or isn't the case. Meanwhile, わけがない is typically used when the speaker refutes a claim or thought because they believe it's unreasonable or illogical. While both phrases express impossibility, はずがない usually implies an unmet expectation, while わけがない indicates the speaker's affirmation of impossibility beyond doubt.

The phrase はずがない asserts a very strong belief that something can't be the case, often in reaction to a surprising or unexpected event. It generally conveys surprise, denial, or disbelief. On the other hand, ようがない・ようもない refers to something that is practically, physically, or logically impossible to accomplish, often expressing a sense of helplessness or despair. This phrase is used to express the impossibility of an action regardless of one's wishes or intentions.

The expression はずがない has a nuance of something being highly unlikely or almost impossible based on certain information, or from logical reasoning. It's often used to express surprise or disbelief. On the other hand, the expression ものか is a stronger and more definitive denial, similar to saying "absolutely not" or "impossible". It is typically used to express strong determination or rejection.

Both そうもない and はずがない convey a sense of improbability, but their nuances and usage differ. そうもない suggests a lack of evidence leading the speaker to surmise that something is unlikely to happen or be the case. It often expresses a speaker's subjective opinion. On the other hand, はずがない has a stronger degree of certainty, signifying that something is almost impossible or highly unlikely. It is often used when contradicting a stated or assumed idea or expectation with confidence based on common sense or established facts.