impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"
marked by quiet and caution and secrecy; taking pains to avoid being observed; "a furtive manner"; "a sneak attack"; "stealthy footsteps"; "a surreptitious glance at his watch"
having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding; "mysterious symbols"; "the mystical style of Blake"; "occult lore"; "the secret learning of the ancients"
disposed to avoid notice; "they considered themselves a tough outfit and weren't bashful about letting anybody know it"; (`blate' is a Scottish term for bashful)
self-consciously timid; "I never laughed, being bashful; lowering my head, I looked at the wall"- Ezra Pound
exercising caution or showing care or attention; "they were careful when crossing the busy street"; "be careful to keep her shoes clean"; "did very careful research"; "careful art restorers"; "careful of the rights of others"; "careful about one's behavior"
with care and dignity; "walking at the same measured pace"; "with all deliberate speed"
mindful of the future in spending money; "careful with money"
cautiously attentive; "careful of her feelings"; "heedful of his father's advice"
full of cares or anxiety; "Thou art careful and troubled about many things"-Luke 10.41
marked by keen caution and watchful prudence; "they were wary in their movements"; "a wary glance at the black clouds"; "taught to be wary of strangers"