adj.
Pronunciation: - ' thi ŋ -k ə -b ə l
Function: adjective
Date: 15th century
1 : not capable of being grasped by the mind
2 : being contrary to what is reasonable, desirable, or probable : being out of the question
– un · think · abil · i · ty \ ˌ ə n- ˌ thi ŋ -k ə - ' bi-l ə -t ē \ noun
– un · think · ably \ ˌ ə n- ' thi ŋ -k ə -bl ē \ adverb