EnglishMerriam-Webster Dictionary
,
half-baked, half-witted, harebrained, insane, loony (
also looney)
, mad, nonsensical, nutty, preposterous, simpleminded, stupid, weak-minded, witless2 based on sound reasoning or information //those playing rules sound reasonable to me commonsense, commonsensible, commonsensical, firm, good, hard, informed, just, justified, levelheaded, logical, rational, reasoned, sensible, sober, solid, valid, well-founded groundless, illogical, invalid, irrational, nonrational, nonsensical, nonvalid, unfounded, uninformed, unjustified, unreasonable, unreasoned, unsound 3 costing little //desperately trying to find reasonable hotel rates for the holiday weekend