careless;  stupid;  thoughtless;  heedless;  unobservant;  inadvertent
 openhearted;  frank;  broad-minded
 to apologize for a long neglect of friends (apologise)
 not having met or contacted someone for a long time;  neglect of friends
 spaciousness;  extensiveness;  expansiveness;  vastness
 the open sky and the serene sea;  as open as the sky and serene as the sea;  magnanimous
 very careless;  quite thoughtless
 cheerful;  lively;  lighthearted
 magnanimous in one's attitude of mind;  grand in one's idea or mind-set