HinKhoj Dictionary

The prefix mal- is usually added to change the meaning to negative and refers to bad, unpleasant or unsuccessful things.
Words Based on the Mal Root Word
Mala fide: दुर्भावनापूर्ण (Doing something in bad faith, in an attempt to deceive someone)
Maladjusted: अव्यवस्थित (A bad ability to adjust to a social environment)
Malign: हानिकारक (Evil-natured)
Malady: Bad disease
Malcontent: असंतुष्ट (One who is dissatisfied and wants to change a bad for him situation)
Malediction: शाप (Curse words uttered to cause evil)
Malefactor: अपराधी (One who committed a crime or did a bad thing)
Malformed: विकृत (Badly formed (bodies))
Malice: दुर्भावना (Desire to inflict harm or evil on others)
Malignant: घातक (Evil-natured, bad for health)

Never take incomplete knowledge, because incomplete knowledge is like a pot half filled with water. Doesn’t work but spills a lot.
अधूरा ज्ञान कभी मत लो, क्योंकि अधूरा ज्ञान आधे जल से भरे घड़े की तरह होता है। काम आता नहीं मगर छलकता बहुत है।

Quintessential: सर्वोत्कृष्ट (Representing the most perfect or typical example of a quality or class)
Quip: ताना (Witty remark)
Radical: उग्र (Extreme)
Rampage: हिंसा (Violence)
Rapid: तेज़ (Having great speed)
Rapport: घनिष्ठता (Harmony)
Recalcitrant: आज्ञा न माननेवाला (Obstinately defiant of authority, difficult to manage)
Reliant: (विश्वासी) having or showing dependence on something

A person who is above hundred years - Centenarian
A book published after the death of its author - Posthumous
A cinema show which is held in the afternoon - Matinee
A citizen of the world - Cosmopolite
A contagious disease which spreads over a huge area - Epidemic
A drug or other substance that induces sleep - Soporific

Damage : Loss, harm, injury
Decorate : Adorn, embellish
Deformity : Malformation, disfigurement
Earnest : Serious, solemn
Emergency : Exigency
Exceptional : Unusual, rare
False : Untrue, spurious
Fascinate : Charm, enchant
Ferocious : Fierce, savage