adj

• (now chiefly botany, zoology) Blunt; not sharp, pointed, or acute in form.
  "For we see a Feather or a Rush drawn along the Lip or Cheek, doth tickle; whereas a thing more obtuse, or a touch more hard, doth not."
• (now chiefly botany, zoology) Blunt; not sharp, pointed, or acute in form.
  "The Herb Pantagruelion hath a little Root somewhat hard and ruff, roundish, terminating in an obtuse and very blunt Point, and having some of its Veins, Strings or Filaments coloured with some spots of white, […]"
• (now chiefly botany, zoology) Blunt; not sharp, pointed, or acute in form.
  "If you put foure Spleets in a Hiue, then cut their backes, where they must leane one against another, to square angles, such as be foure in a circle: if but three, cut them to obtuse angles, such as are three in a circle: (you may readily try them, before you put them in, by Moulds made iust to those formes) and so will they stand close and firme together."
• (now chiefly botany, zoology) Blunt; not sharp, pointed, or acute in form.
  "Unless A lies in that part of a semi-infinite strip bounded by AB outside a semi-circle of diameter AB, the triangle is obtuse, so that the probability of getting an obtuse triangle is equal to 1."

verb

• (transitive, obsolete) To dull or reduce an emotion or a physical state.
  "Fouler. To tread, ſtampe, or trample on; to bruiſe, or cruſh, by ſtamping; hurt, or obtuſe, by treading on; […]"