Radical (بنیادی) means relating to or affecting the fundamental nature of something. 'Basic' (بنیادی) or fundamental is the correct meaning.

Radiant (روشن) means 'shining' (چمکتا ہوا) or glowing brightly. It can also mean emanating great joy or health.

A quorum (کورم) is the 'necessary minimum number' (کم از کم ضروری تعداد) of members of an assembly or society that must be present for business to be validly transacted.

Quid pro quo (کچھ کے بدلے کچھ) is a Latin phrase meaning 'one thing in return for another' (ایک چیز کے بدلے دوسری چیز); a favor for a favor.

A queue (قطار) is a 'line of people' (لوگوں کی قطار) or vehicles waiting their turn for something.

To quench (بجھانا) means to satisfy thirst, or 'to extinguish' (آگ بجھانا) a fire. 'Kindle' (جلانا) is an antonym.

Queer (عجیب) means 'strange' (عجیب و غریب) or odd. 'Familiar' (جانا پہچانا) and 'Ordinary' (عام) are antonyms.

Quasi (گویا) is a prefix meaning 'seeming to be' (ظاہری طور پر) or 'partly'; apparently but not really. 'Feeling nauseated' (متلی محسوس کرنا) is 'queasy'.

A quarry (شکار) is an animal 'prey' (شکار) pursued by a hunter. It is also a place where stone is extracted from the ground.

A quantum leap (بڑی چھلانگ) is a huge, sudden increase or advance. 'Breakthrough' (کامیابی) is a direct synonym. 'Slow progress' (سست ترقی) is the antonym.