unbelief, disbelief, infidelity, atheism, irreligion, ingratitude, ungratefulness, unthankfulness, thanklessness.
Denial, unbelief, ingratitude (see kâfir).
Denial of the Truth, rebellion against God
disbelief, rejection of the truth.
Its original meaning is 'to conceal'. This word has been variously used in the Qur'an to denote: (1) state of absolute lack of faith; (2) rejection or denial of any of the essentials of Islam; (3) attitude of ingratitude and thanklessness to God; and (4) non-fulfilment of certain basic requirements of faith. In the accepted technical sense, kufr consists of rejection of the Divine Guidance communicated through the Prophets and Messengers of God. More specifically, ever since the advent of the last of the Prophets and Messengers, Muhammad (S.A.W.), rejection of his teaching constitutes Kufr.
to cover up the truth, disbelief, to reject Allah and refuse to believe that Muhammad is his Messenger.
to show ungratefulness to Allah and not to believe in Him and His religion.