| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | unsystematic |
| Synonyms: | illogical, impulsive, irrational |
| Main Entry: | approximate |
| Part of Speech: | adjective |
| Definition: | inexact |
| Synonyms: | estimated, guessed, imperfect, imprecise, loose, rough, surmised, uncertain, unprecise, unscientific |
| Main Entry: | arbitrary |
| Part of Speech: | adjective |
| Definition: | whimsical, chance |
| Synonyms: | approximate, capricious, discretionary, erratic, fanciful, frivolous, inconsistent, injudicious, irrational, irresponsible, offhand, optional, random, subjective, supercilious, superficial, unaccountable, unreasonable, unscientific, wayward, willful |
| Antonyms: | circumspect, rational, reasonable, reasoned, supported |
| Main Entry: | illogical |
| Part of Speech: | adjective |
| Definition: | not making sense |
| Synonyms: | absurd, casuistic, cockeyed, fallacious, false, fatuous, faulty, groundless, hollow, implausible, inconclusive, incongruous, inconsequent, inconsistent, incorrect, invalid, irrational, irrelevant, mad, meaningless, not following, nutty, off the wall, preposterous, screwy, self-contradictory, senseless, sophistic, sophistical, specious, spurious, unconnected, unproved, unreasonable, unscientific, unsound, unsubstantial, untenable, wacky, without basis, without foundation |
| Antonyms: | correct, logical, meaningful, rational, reasonable, right, sensible |
| Main Entry: | invalid |
| Part of Speech: | adjective |
| Definition: | worthless; unfounded |
| Synonyms: | bad, baseless, fallacious, false, ill-founded, illogical, inoperative, irrational, mad, not binding, not working, nugatory, null, null and void, reasonless, sophistic, unreasonable, unreasoned, unscientific, unsound, untrue, void, wrong |
| Antonyms: | sound, valid, worthwhile, worthy |
| Main Entry: | judgmental |
| Part of Speech: | adjective |
| Definition: | arbitrary |
| Synonyms: | approximate, capricious, discretionary, erratic, fanciful, frivolous, inconsistent, injudicious, irrational, irresponsible, offhand, optional, personal, random, subjective, supercilious, superficial, unaccountable, unreasonable, unscientific, wayward, willful |