#1 thoughtfulness n. [contemplation, reflection, reflexion, rumination, musing] a calm, lengthy, intent consideration. wn #2 thoughtfulness n. [consideration, considerateness] kind and considerate regard for others; "he showed no consideration for her feelings". wn #3 thoughtfulness n. the trait of thinking carefully before acting. wn #4 thoughtfulness n. [consideration] a considerate and thoughtful act. wn