serendipitous

occasional offhand spontaneous

accidental adventitious by chance by-the-way contingent erratic extemporaneous extempore fluky fortuitous impromptu improvised impulsive incidental infrequent irregular odd uncertain unexpected unforeseen unintentional unplanned unpremeditated

deliberate planned

formal painstaking premeditated serious

fortunate odd random unforeseen

arbitrary casual chance contingent fluke fluky haphazard happy incidental luck in luck out lucky-dog providential unplanned

calculated deliberate designed intentional planned unlucky

accessible advantageous applicable conducive constructive convenient cooperative crucial essential favorable friendly important invaluable practical productive profitable significant suitable supportive sympathetic timely useful valuable

accommodating benevolent bettering caring considerate contributive effectual efficacious fortunate good for improving instrumental kind neighborly operative pragmatic serviceable symbiotic usable utilitarian

cold cool disagreeable hindering hurting inappropriate inessential injurious inopportune insignificant minor nonessential trivial unfavorable unfriendly unhelpful unimportant unsociable unsuitable useless worthless

disadvantageous harmful hurtful unconstructive

fortuitous happy hot successful

advantageous adventitious all systems go auspicious beneficial benign blessed charmed coming up roses everything going favored felicitous getting a break golden hit it big holding aces hopeful in the groove into something on a roll on a streak promising propitious prosperous providential striking it rich timely well

unlucky

bad inopportune unfortunate unpropitious unsuccessful