Meaning: a confusing and difficult problem or question
Synonym: quandary, dilemma; riddle, puzzle,
Sentence: "one of the most difficult conundrums for the experts"
Meaning: endless or apparently endless (often used hyperbolically)
Synonym: ceaseless, unceasing, incessant, constant, continual
Antonym: brief, ceasing, ending, ephemeral, halting , intermittent
Sentence: "we got bogged down in interminable discussions"
Meaning: (of a child) having developed certain abilities or inclinations at an earlier age than is usual or expected.
Synonym: ahead, gifted, talented,
Antonym: backward, slow
Sentence: "a precocious, solitary boy"
Meaning: read (something), typically in a thorough or careful way.
Synonym: reread; proofread; decipher;
Sentence: "he has spent countless hours in libraries perusing art history books and catalogues"
Meaning: not securely held or in position; dangerously likely to fall or collapse.
Synonym: uncertain, insecure, unreliable, unsure, unpredictable,
Antonym: safe, secure
Sentence: "a precarious ladder"
Meaning: a teacher or instructor., the headmaster or principal of a school
Sentence: a preceptor at a small English boarding school
Meaning: exclude from a society or group.
Synonym: repudiate, boycott, blackball, blacklist
Antonym: welcome, accept, befriend, include
Sentence: "she was declared a witch and ostracized by the villagers"
Meaning: feeling or expressing remorse at the recognition that one has done wrong.
Synonym: remorseful, repentant, penitent, regretful
Antonym: unrepentant, defiant
Sentence: "a contrite tone"
Meaning: (of a medicine or medical care) relieving pain without dealing with the cause of the condition
Synonym: soothing, alleviating, sedative, calmative, calming
Antonym: aggravate, exacerbate
Sentence: "orthodox medicines tend to be palliative rather than curative"
Meaning: making a show of being morally superior to other people.
Synonym: self-righteous, holier-than-thou, pious
Sentence: "what happened to all the sanctimonious talk about putting his family first?"