askew
adj.slanted or not in a straight line. You use this to describe something that is tilted or not sitting properly.
adj.slanting or not in a straight line; out of alignment. Often used to describe physical objects or, figuratively, a person's posture or a situation that is slightly off.
“The picture is hanging slightly askew on the wall.”
“The old wooden fence was leaning so far askew that it looked like it might fall over in the next wind.”
“The detective's hat sat slightly askew, a detail that added to his rugged, slightly disheveled appearance as he surveyed the crime scene.”
From Old Norse á ská (“askew, askance”), equivalent to a- + skew. Compare Icelandic á ská (“diagonally”), Danish skrå (“slanting, oblique”), German Schräge (“slope, slant”).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.