Difference between Insincere and Sincere

INSINCERE vs SINCERE: ADJECTIVE

Habitually phony or dishonest.
Lacking sincerity
Not being in truth what one appears to be; not sincere; dissembling; hypocritical; disingenuous; deceitful; false; -- said of persons; also of speech, thought; etc..
Disappointing; imperfect; unsound.
Not sincere
Not serious
Not sincere; not genuine.

Open and genuine; not deceitful
Characterized by a firm and humorless belief in the validity of your opinions
Not feigned or affected; genuine.
Being without hypocrisy or pretense; true.
Pure; unadulterated.
Pure; unmixed; unadulterated.
Whole; perfect; unhurt; uninjured.
Being in reality what it appears to be; having a character which corresponds with the appearance; not falsely assumed; genuine; true; real.
Honest; free from hypocrisy or dissimulation.
Earnest; meaning what one says or does; truthful.
Meant truly or earnestly.

Synonyms Disingenuous, uncandid, double-faced, hollow.
Not sincere in quality; simulated; deceptive; false.
Not sincere in character; making a false or hypocritical show of opinions or feelings.
Not genuine; unsound; imperfect.

Sound; whole; unbroken; without error, defect, or injury.
Pure; unmixed; unadulterated; free from imitation; good throughout: as, sincere work.
Having no admixture; free; clear: followed by of.
Unalloyed or unadulterated by deceit or unfriendliness; free from pretense or falsehood; honestly felt, meant, or intended: as, a sincere wish; a sincere effort.
Free from duplicity or dissimulation; honest in speech or intention; guileless; truthful; frank.
Morally pure; undepraved; upright; virtuous; blameless.
Synonyms and Fair, Open, etc. (see candid); Cordial, Sincere, etc. (see hearty), unfeigned, undissembling, artless, heartfelt.
Open and genuine
Not deceitful

Fulsome, Feigned, Oleaginous, Fawning, False, Dissembling, Unctuous, Bootlicking, Meretricious, Sycophantic, Hollow, Smarmy, Specious, Obsequious, Hypocritical

Heart whole, Bona fide, Dear, Serious, Solemn, Devout, True, Unfeigned, Earnest, Fervent, Wholehearted, Cordial, Honest, Genuine, Heartfelt

Fulsome, Feigned, Oleaginous, Fawning, False, Dissembling, Unctuous, Bootlicking, Meretricious, Sycophantic, Hollow, Smarmy, Specious, Obsequious, Hypocritical

Heart whole, Bona fide, Dear, Serious, Solemn, Devout, True, Unfeigned, Earnest, Fervent, Wholehearted, Cordial, Honest, Genuine, Heartfelt

Sincere wishes on your anniversary, Mom and Dad!
One integral and sincere confession within nine days.
Please believe in my feelings of sincere friendship.
Please be reflective and sincere in your discussion.
Crown patrons has often been read as sincere.
Finallymy most sincere thanks to my wife Lauren.
He is childlike, simple, humble, sincere, and forgiving.
Heather Price is sincere, laid back and professional.
Those sincere men who told them so believed it because an earlier generation of sincere men had told them the very same thing.
Her narratives combine sincere anxiety and sincere compassion.

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