rational

I

(New American Roget's College Thesaurus)

adj. sound, sane, logical, sensible, reasonable. See reasoning, intellect, sanity.Ant., irrational, insane.

II

(Roget's IV) modif.

1. [Acting in accordance with reason]

Syn. reasonable, logical, sensible, stable, calm, cool, deliberate, discerning, discriminating, level-headed, collected, ratiocinative, thoughtful, knowing, of sound judgment, showing good sense, impartial, exercising reason, intelligent, wise, reasoning, prudent, circumspect, intellectual, reflective, philosophic, objective, far-sighted, enlightened, well-advised, judicious, analytical, deductive, synthetic, perspicacious, conscious, balanced, sober, systematic, all there*, together*; see also reasonable 1 .

Ant. irrational, absurd, rash*.

2. [Of a nature that appeals to reason]

Syn. intelligent, sensible, wise; see judicious , reasonable 1 , 2 .

3. [Sane]

Syn. normal, lucid, responsible, clearheaded; see sane 1 .

Syn.- rational implies the ability to reason logically, as by drawing conclusions from inferences, and often connotes the absence of emotionalism [ a rational explanation for the mysterious events ] ; reasonable suggests the use of practical reason in making decisions, choices, etc. that are fair or show good judgment [ a reasonable solution to a problem ] ; sensible implies the use of common sense or sound judgment [ you made a sensible decision ]

III

(Roget's 3 Superthesaurus) a.

sane, reasonable, of sound mind, clear-thinking, sensible, levelheaded, sober, *with it, lucid, logical.

ANT.: irrational, unreasonable, nonsensical, insane

IV

(Roget's Thesaurus II) adjective 1. Able to reason validly: analytic, analytical, logical, ratiocinative. See REASON. 2. Possessing, proceeding from, or exhibiting good judgment and prudence: balanced, commonsensi-ble, commonsensical, judicious, levelheaded, prudent, reasonable, sagacious, sage, sane, sapient, sensible, sound2, well-founded, well-grounded, wise1. See REASON, SANE. 3. Mentally healthy: compos mentis, lucid, sane. Idioms: all there, in one's right mind, of sound mind. See SANE. 4. Consistent with reason and intellect: consequent, intelligent, logical, reasonable. See REASON.