We have put together a list of words that are similar to RATIONAL.

11 Alternative Words Similar to rational

1 Intellectual Adjective      Synonym Words Like Intellectual
2 Logical Adjective      Related Words Like Logical
3 Reasonable Adjective      Related Words Like Reasonable
4 Sensible Adjective      Related Words Like Sensible
5 Intelligent Adjective      Similar Words Like Intelligent
6 Lucid Adjective      Similar Words Like Lucid
7 Reasoning Adjective      Similar Words Like Reasoning
8 Thinking Adjective      Similar Words Like Thinking
9 Wise Adjective      Synonym Words Like Wise
10 Graphic Adjective      Synonym Words Like Graphic
11 Formula Adjective      Variant Words Like Formula

4 examples of rational

1 rational conduct; a rational man.
2 the triumph of the rational over the animal side of man
3 a process of rational inference
4 rational thought

10 definitions of rational

1 Relating to the reason; not physical; mental.
2 Having reason, or the faculty of reasoning; endowed with reason or understanding; reasoning.
3 Agreeable to reason; not absurd, preposterous, extravagant, foolish, fanciful, or the like; wise; judicious
4 Expressing the type, structure, relations, and reactions of a compound; graphic; -- said of formulæ. See under Formula.
5 A rational being.
6 an integer or a fraction
7 having its source in or being guided by the intellect (as distinguished from experience or emotion)
8 of or associated with or requiring the use of the mind
9 capable of being expressed as a quotient of integers
10 consistent with or based on or using reason
We get our data from many different dictionaries across the web:
Wordnik, Wiktionary, Century, American Heritage, Gcide