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ascertain	to learn without question; determine.
ask	to put a question to. [1/5 definitions]
calculation	the process of getting an answer to a number question by adding, subtracting, multiplying, or dividing. The answer that is reached at the end of this process can also be called a calculation.
certainly	without doubt or question. [1/2 definitions]
challenge	a calling into question; request for an explanation or proof. [2/6 definitions]
crush	to put down or defeat without question. [1/5 definitions]
custom	(plural but used with a singular verb) the process in which official people inspect goods and question travelers about what things they are bringing into a country, or the place where this is done. [1/4 definitions]
deliberate	to think about an issue or question in a careful and thorough way, sometimes by discussing them with others. [1/3 definitions]
determine	to decide or settle finally and without question. [1/3 definitions]
dispute	to question the value or truth of. [1/4 definitions]
do¹	used to introduce a question or make a negative statement with "not." [1/12 definitions]
figure out	to find an answer to a problem or puzzling question by using the power of the mind.
flat¹	absolutely; without question. [1/12 definitions]
for certain	without question; definitely.
hook, line, and sinker	(informal) without any question or hesitation; completely.
indeed	without any question or doubt; truly. [1/2 definitions]
inquire	to ask a question in order to receive information (usually followed by "about" or "of").
inquiry	a question or request for information. [1/2 definitions]
interrogate	to question at length and in a thorough way, often for an official purpose.
interrogative	having to do with, forming, or being a question. "Why don't you take a walk?" is an example of an interrogative sentence. [2 definitions]
interrogative sentence	a sentence that asks a question. "Have you read this book?" is an example of an interrogative sentence.

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