残念【ざんねん】
regrettable, unfortunate, disappointing, vexing
記念【きねん】
commemoration, celebration, remembrance, memory, honoring the memory of, memento, souvenir, keepsake
信念【しんねん】
belief, faith, conviction
念のため【ねんのため】
(just) making sure, just to be sure, just in case, for caution's sake
記念日【きねんび】
memorial day, commemoration day, anniversary
懸念【けねん】
worry, fear, anxiety, concern
概念【がいねん】
general idea, concept, notion
専念【せんねん】
absorption, giving undivided attention, devoting oneself (to)
観念【かんねん】
idea, notion, concept, conception, sense (e.g. of duty), resignation (to one's fate), acceptance, preparedness, observation and contemplation, meditation
理念【りねん】
(Platonic) ideal (of how things ought to be, e.g. human rights), foundational principle, idea, conception (e.g. of the university), doctrine, ideology
念頭【ねんとう】
(on one's) mind, heed
断念【だんねん】
abandoning (hope, plans), giving up
念願【ねんがん】
one's heart's desire, one's dearest wish
執念【しゅうねん】
tenacity, persistence, obsession, implacability
入念【にゅうねん】
careful, elaborate, scrupulous
念入り【ねんいり】
careful, scrupulous, thorough, conscientious, elaborate, deliberate, attentive
念仏【ねんぶつ】
nembutsu, nianfo, the three-word invocation "Namu Amida Butsu" dedicated to the Amitabha Buddha, visualizing a Buddha (in one's mind)
正念場【しょうねんば】
critical moment, do-or-die situation, critical juncture
疑念【ぎねん】
doubt, suspicion, misgivings, scruples
丹念【たんねん】
painstaking, careful, meticulous, scrupulous, detailed, elaborate