oblique

Not erect or perpendicular; not parallel to, or at right angles from, the base

Not straightforward; obscure or confusing

disingenuous; underhand; morally corrupt

Not direct in descent; not following the line of father and son; collateral.

(botany, of leaves) Having the base of the blade asymmetrical, with one side lower than the other.

(botany, of branches or roots) Growing at an angle that is neither vertical nor horizontal.

(grammar) Pertaining to the oblique case (non-nominative).

(grammar, of speech or narration) Indirect; employing the actual words of the speaker but as related by a third person, having the first person in pronoun and verb converted into the third person and adverbs of present time into the past, etc.

(music) Employing oblique motion, motion or progression in which one part (voice) stays on the same note while another ascends or descends.