sincerity noun
ADJ. complete, deep, great, total | genuine, passionate | apparent ‘It's wonderful,’ he said with apparent sincerity.
VERB + SINCERITY doubt, mistake, question There seems no reason to doubt the sincerity of his beliefs. There was no mistaking his sincerity. | be convinced of She wasn't yet convinced of his sincerity. | demonstrate, prove, show
PREP. with ~
You can also check other dicts: sincerity (English, 中文解释 ), wordnet sense, Collins Definition