straight

adjective

• 1extending or moving uniformly in one direction only; without a curve or bend:a long, straight road
• (of hair) not curly or wavy.
• (of a garment) not flared or fitted closely to the body:a straight skirt
• (of an aim, blow, or course) going direct to the intended target:a straight punch to the face
• Geometry (of a line) lying on the shortest path between any two of its points.
• (of an arch) flat-topped.

• 2properly positioned so as to be level, upright, or symmetrical:he made sure his tie was straight
• [predic.] in proper order or condition:it’ll take a long time to get the place straight

• 3not evasive; honest:a straight answer thank you for being straight with me
• simple; straightforward:a straight choice between nuclear power and penury
• (of a look) bold and steady:he gave her a straight, no-nonsense look
• (of thinking) clear, logical, and unemotional.

• 4 [attributive] in continuous succession:he scored his fourth straight win

• 5(of an alcoholic drink) undiluted; neat:straight brandy

• 6(especially of drama) serious as opposed to comic or musical:a straight play

• 7 informal (of a person) conventional or respectable:she looked pretty straight in her school clothes
• heterosexual.

adverb

• 1in a straight line; directly:he was gazing straight at her keep straight on
• with no delay or diversion; directly or immediately:after dinner we went straight back to our hotel I fell into bed and went straight to sleep
• archaic at once; immediately:I’ll fetch up the bath to you straight

• 2in or into a level, even, or upright position:he pulled his clothes straight sit up straight!

• 3correctly; clearly:I’m so tired I can hardly think straight
• honestly and directly; in a straightforward manner:I told her straight—the kid’s right

• 4without a break; continuously:he remembered working sixteen hours straight

noun

• 1a part of something that is not curved or bent, especially a straight section of a racecourse:he pulled away in the straight to win by half a second
• archaic a form or position that is not curved or bent:the rod flew back to the straight

• 2(in poker) a continuous sequence of five cards.

• 3 informal a conventional person.
• a heterosexual person.

• 4South African informal (in township slang) a 750 ml bottle of alcoholic drink.

  [perhaps a transferred sense of US slang straight 'unadulterated whisky']