deliberate

Synonyms: advised aforethought calculated careful cautious coldblooded conscious considered cut-and-dried designed designful done on purpose express fixed intended judged meticulous planned pondered prearranged predesigned predeterminate predetermined premeditated prepense projected provident prudent purposed purposeful purposive reasoned resolved schemed scrupulous studied studious thoughtful thought out voluntary wary weighed willful with forethought witting

Antonyms: chance indeterminate unintentional unmethodical unsystematic unwitting

Synonyms: argue bat it around cerebrate chew over cogitate consider consult contemplate debate excogitate hammer away at judge kick around knock around meditate mull over muse ponder pour it on put on thinking cap rack brains reason reflect revolve roll ruminate run up a flagpole speculate stew over study sweat over talk over turn over weigh