Main word: Quixotic means exceedingly idealistic, unrealistic, and impractical.
Synonym: Idealistic means guided by noble but often unrealistic ideals.
In common: Both describe impractical idealism.
Main word: Quell means to put an end to something, usually by force.
Synonym: Suppress means to forcibly stop or restrain.
In common: Both involve stopping or controlling forcefully.
Main word: Quack means an unqualified or fraudulent doctor.
Synonym: Unqualified means lacking the necessary training or credentials.
In common: Both refer to incompetence or lack of real expertise.
Main word: Quarantine means enforced isolation to prevent disease spread.
Synonym: Isolation means being separated from others.
In common: Both describe separation for safety or health reasons.
Main word: Quagmire means a difficult or tricky situation.
Synonym: Predicament means a challenging or unpleasant situation.
In common: Both describe being stuck in difficulty.
Main word: Quaint means attractively unusual or old-fashioned.
Synonym: Strange means unusual or out of the ordinary.
In common: Both describe something unusual or uncommon.
Main word: Qualified means having the necessary ability or credentials.
Synonym: Competent means having the required skill or capability.
In common: Both describe capability and suitability.
Main word: Qualify means to meet the requirements or make eligible.
Synonym: Authorize means to officially approve or give power.
In common: Both involve meeting conditions for approval.
Main word: Quandary means a state of uncertainty or confusion.
Synonym: Predicament means a difficult or tricky situation.
In common: Both describe being stuck in uncertainty.
Main word: Quantitative means related to measuring quantity.
Synonym: Measurable means capable of being measured.
In common: Both refer to something that can be expressed in numbers or measurement.