Synonym: authentic, bona fide, genuine, honest, legitimate, real, unaffected. Antonym: false. Similar words: insincere, sincerely, cereal, cerebrum, ceremony, cerebral, sorceress, cancer. Meaning: [sɪn'sɪr /-'sɪə] 
adj. 1. open and genuine; not deceitful 2. characterized by a firm and humorless belief in the validity of your opinions.
adj. 1. open and genuine; not deceitful 2. characterized by a firm and humorless belief in the validity of your opinions. 
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1) Her protests seemed sincere enough.
2) His was a sincere offer of help.
3) He's sincere in his views.
4) Please accept our sincere thanks.
5) Please accept our sincere apologies.
6) My sincere congratulations on this auspicious event of yours.
7) He was sincere in his wish to help us.
8) He offered a sincere apology for his behaviour.
9) I'll be open and sincere with you.
10) for our ever-lasting friendship,(http://sentencedict.com/sincere.html) send sincere blessings and warm greetings to my friends whom i miss so much.
11) The details will tell you who is sincere to you.
12) Best wishes and sincere congratulations on your graduation.May this special day be the commencement of the continued series of upward steps to further success.
13) He seems so sincere.
14) Please accept my sincere wishes for the New Year. I hope you will continue to enjoy good health.
15) My sincere thanks to you for being my child's teacher.
16) My sincere congratulations on your happy marriage and my best wishes to you two for a lifetime of happiness.
17) I would like to say a sincere thank you to everyone who has helped and supported me.
18) Season's greetings and sincere wishes for a bright and happy New Year!
19) In the season of joy I present my sincere wishes and kind thoughts.May the kind of Christmas outshine all the rest.
20) In the season of joy I present my sincere wishes and kind thoughts. May the kind of New Year outshine all the rest.
21) For our ever-lasting friendship, send sincere blessings and warm greetings to my friends whom I miss so much.
22) Sincere congratulations on your son wedding please convey our best wish.
23) Nothing in all the world is more dangerous than sincere ingnorance and conscientious stupidity. 
24) Don't try to win a friend by presenting gifts. You should instead contribute your sincere love and learn how to win others 'heart through appropriate ways.
25) We are very happy to learn that you have successfully passed the college entrance examination this year and have been admitted into Beijing University with honor.Allow us to offer our most sincere congratulations on this happy occasion and wish you greater achievement in your college education.
26) I'm delighted to receive the announcement of your marriage and now send you and your Frank my sincere congratulations and best wishes for a happy and harmonious life together.
27) His proposal was no jest - he was completely sincere.
28) You make my heart smile. In such a soft and warm season, please accept my sincere blessing and deep concern for you. For our ever-lasting friendship, send sincere blessings and warm greetings to my friends whom I miss so much. Wish you a happy new year and a good fortune in the coming year when we will share our happiness, think of our good friends, and our dreams come true!
29) Thinking of you at Christmas with a wish that is warm and sincere.Have a wonderful Christmas andjoyous New Year!
30) Time flies by and I remember I haven't seen you for ages.I send you a fine card with my missing and sincere blessing.
More similar words: insincere, sincerely, cereal, cerebrum, ceremony, cerebral, sorceress, cancer, ceremonial, dancer, since, ceremonious, concert, concern, concerned, uncertain, concerning, ever since, long since, disinterested, necromancer, uncertainty, marriage ceremony, going concern, remembrancer, disconcerting, adherence, coherence, be concerned about, deference.