obtuse

形容词 obtuse:

1. of an angle; between 90 and 180 degrees
2. of a leaf shape; rounded at the apex
3. lacking in insight or discernment- Jasper Griffin
   同义词：purblind
4. slow to learn or understand; lacking intellectual acuity
   同义词：dense, dim, dull, dumb, slow

1. An obtuse leaf.
   钝形圆头的叶子尖
2. An obtuse, boring, or bothersome person; a pest.
   讨厌的人愚钝的、无聊的或讨厌的人; 害人精

ob.tuse

adj.（形容词）
ob.tus.er,ob.tus.est
Lacking quickness of perception or intellect.See Synonyms at stupid
迟钝的：缺少感觉或智力的参见 stupid

Not sharp, pointed, or acute in form; blunt.
钝的：不锐利的、不尖的或在形状上不尖锐的；钝的
Botany Having a blunt or rounded tip:
【植物学】 钝形或圆头的：有一钝形或圆头的尖的：
例句：
an obtuse leaf.
钝形圆头的叶子尖

来源：
Middle English
中古英语
from Old French
源自 古法语
from Latin obtôsus [past participle of] obtundere [to blunt] * see obtund
源自 拉丁语 obtôsus [] obtundere的过去分词 [使…钝] *参见 obtund

【引伸】
obtuse.ly
adv.（副词）
obtuse.ness
n.（名词）