Merriam-Webster's Dictionary and Thesaurus - Merriam-Webster [1401]
Antonyms
heedless, inconsiderate, thoughtless, unthinking
thought·ful·ly adverb : in a thoughtful manner
Synonyms
courteously, kindly, nicely, well—more at WELL
thought·less adjective 1 : insufficiently alert : CARELESS 2 : RECKLESS 3 : lacking concern for others : INCONSIDERATE <~ remarks> — thought·less·ly adverb — thought·less·ness noun Synonyms discourteous, ill-bred, ill-mannered, impertinent, impolite, inconsiderate, rude, uncivil, ungracious, unmannerly—more at IMPOLITE thou·sand noun, plural thousands or thousand : 10 times 100 — thousand adjective — thou·sandth adjective or noun thousands place noun : the place four to the left of the decimal point in an Arabic number thrall noun 1 : a servant slave : BONDMAN 2 : a state of servitude Synonyms [1] bondman, chattel, slave—more at SLAVE [2] bondage, enslavement, servitude, slavery, yoke—more at SLAVERY thrall·dom or thral·dom noun : the state or condition of servitude thrash verb 1 : THRESH 1 2 : to defeat decisively or severely : BEAT 3 : to move about violently 4 : to go over again and again <~ over the matter>; also : to hammer out <~ out a plan> 5 : to swing, beat, or strike in the manner of a rapidly moving flail Synonyms [2] beat, best, clobber, conquer, crush, defeat, drub, lick, rout, skunk, triumph, trounce, wallop, whip, win—more at BEAT [5] flail, flog, hide, lash, scourge, slash, switch, whale, whip 1thrasher noun : one that thrashes or threshes 2thrasher noun : any of various long-tailed American songbirds related to the mockingbird 1thread noun 1 : a thin continuous strand of spun and twisted textile fibers 2 : something resembling a textile thread 3 : the ridge or groove that winds around a screw 4 : a line of reasoning or train of thought 5 : a continuing element 2thread verb 1 : to pass a thread through the eye of (a needle) 2 : to pass (as film) through something 3 : to make one's way through or between 4 : to put together on or as if on a thread <~ beads> 5 : to form a screw thread on or in 6 : to interweave with or as if with threads Synonyms interlace, intersperse, intertwine, interweave, lace, weave, wreathe; also insert, intermingle, mingle, mix; alternate, juxtapose; amalgamate, assimilate, blend, combine, commingle, embody, fuse, incorporate, integrate, merge thread·bare adjective 1 : worn to the point that the threads show : having the nap worn off 2 : having no interest or freshness : TRITE Synonyms [1] ragged, ratty, seedy, shabby, tattered, worn-out—more at RAGGED [2] banal, commonplace, hackneyed, musty, stale, stereotyped, tired, trite—more at STALE thready adjective 1 : consisting of or bearing fibers of filaments 2 : lacking in fullness, body, or vigor threat noun 1 : an expression of intent to do harm 2 : one that threatens Synonyms danger, hazard, menace, peril, pitfall, risk, trouble—more at DANGER threat·en verb 1 : to utter threats against 2 : to give signs or warning of : PORTEND 3 : to hang over as a threat : MENACE 4 : to cause to feel insecure or anxious — threat·en·ing·ly adverb Synonyms hang, hover, menace, overhang; also endanger, hazard, imperil, jeopardize threat·ened adjective : having an uncertain chance of continued survival; especially : likely to become an endangered species three noun 1 : one more than two 2 : the 3d in a set or series 3 : something having three units — three adjective or pronoun 3–D noun : a three-dimensional form or picture three–dimensional adjective 1 : relating to or having three dimensions 2 : giving the illusion of varying distances three·fold adjective 1 : having three