Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class II. Words Relating to Space
Section II. Dimensions
2. Linear Dimensions

217. Obliquity.

   NOUN:OBLIQUITY, inclination, incline, slope, slant, skew, thrawnness [Scot. & dial. Eng.]; crookedness &c. adj.; slopeness; leaning &c. v.; bevel, ramp, pitch, bezel, tilt; bias, list, twist, swag [prov. Eng.], sag, cant, lurch; distortion [See Distortion]; bend (curve) [See Curvature]; tower of Pisa.
  ACCLIVITY, rise, ascent, gradient [chiefly Brit.], grade [U. S.], khudd [Hind.], glacis, rising ground, hill, bank, declivity, downhill, dip, fall, devexity [obs.]; gentle -, rapid- slope; easy -ascent, – descent; shelving beach; talus; montagne Russe [F.]; facilis descensus Averni [L.].
  steepness &c. adj.; cliff, precipice (vertical) [See Verticality]; escarpment, scarp; chevron.
  [MEASURE OF INCLINATION] clinometer; sine, cosine, cotangent, angle, hypothenuse.
  diagonal; zigzag.
   VERB:BE OBLIQUE &c. adj.; slope, slant, skew, lean, incline, shelve, stoop, decline, descend, bend, keel, careen, sag, swag [dial.], seel [obs.], slouch, cant, sidle.
  RENDER OBLIQUE &c. adj.; sway, bias; slope, slant; incline, bend, crook; cant, tilt; distort [See Distortion].
   ADJECTIVE:OBLIQUE, inclined; sloping &c. v.; tilted &c. v.; recubant [rare], recumbent, clinal, skew, askew, slant, bias, aslant, plagihedral, indirect, wry, awry; agee or ajee, thrawn [both Scot. & dial. Eng.], crooked; sinuous, zigzag, zigzaggy, chevrony; knock-kneed (distorted) [See Distortion]; bevel, out of the perpendicular; aslope; asquint, backhand or backhanded.
  UPHILL, rising, ascending, acclivous.
  DOWNHILL, falling, descending; hanging (as, hanging gardens), declining, declivitous, proclivous [rare], declivous, devex [obs.], synclinal, anticlinal.
  STEEP, abrupt, precipitous, breakneck.
  DIAGONAL; transverse, transversal; athwart, antiparallel; curved [See Curvature]; loxic, loxotic, loxodromic.
   ADVERB:OBLIQUELY &c. adj.; on one side, all on one side; askew, askance or askant, awry, skew, skewed, edgewise, at an angle; sidelong, sideways; slopewise, slantwise; by a side wind.