The Oxford Thesaurus An A-Z Dictionary of Synonyms INTRO ...

illogical, irrational, incongruous, meaningless, absurd, wild,
mad, crazy, demented, insane, asinine, nonsensical, imbecilic or
imbecile, idiotic, moronic, simple-minded, fatuous, stupid,
foolish, silly, dizzy, halfwitted, mindless, brainless, witless,
empty-headed, thimble-witted, pea-brained, bird-brained,
hare-brained, feather-headed, rattle-brained, addle-pated,
muddle-headed, Colloq daft, US daffy, nutty, batty, Slang wacky,
dippy: Many of the government's objections to the plan are just
senseless posturing. He is promoting some senseless plan for
double-decker motorways.
sensibility
n. 1 See sensitivity, 3, below. 2 Often, sensibilities.
feelings, responsiveness, responsivity, emotions, sentiments:
Personal events are more likely to affect our sensibilities than
major disasters in which we are not involved.
sensible adj. 1 reasonable, realistic, logical, common-sense,
commonsensical, rational, reasoned, sound, practical, prudent,
judicious, discreet, intelligent, sage, wise, sane;
down-to-earth, matter-of-fact, well-thought-out: Do you really
think it sensible to go out in this storm? Andrew has a very
sensible way of dealing with junk mail - he returns it to
sender. 2 perceivable, perceptible, detectable, evident,
discernible, recognizable, ascertainable, apprehensible,
cognizable, manifest, palpable, physical, tangible, corporeal,
substantive, material, visible, observable, seeable: Some
maintain that in addition to the sensible world there is another
world, an anti-world, that we do not normally encounter. 3
sentient, feeling, sensitive, live, conscious, aware: Who among
us ever regards microbes as sensible creatures? 4 Usually,
sensible of or to. conscious (of), aware (of), acquainted
(with), cognizant (of), sensitive (to), alive to, mindful (of),
understanding (of), in touch (with), observant (of), awake (to),
alert (to), Slang wise (to), hip or old-fashioned hep (to): The
people of the village are ever sensible to the needs of their
neighbours. There are some things to which we are not at all
sensible. 5 appreciable, significant, considerable, substantial,
substantive, noticeable: The theory is that an increased
interest rate will have a sensible effect on the rate of
inflation.
sensitive adj. 1 delicate, tender, sore, susceptible: My arm is still