否
ヒ, いな, いや

negate, no, noes, refuse, decline, deny

JLPT3 G6 S7 F561

As per 不# (refusal; negation) + 口 mouth → oral *refusal/negation/denial* → *no*; *bad*; *otherwise*; *whether or not* → *as soon as*; *no sooner than* (← practically no time between the occurrence of two events). In derivative characters such as 痞 and 嚭, 否 conveys the concept "bulge," a carryover influence of 不.

[Full Kanji Etymology List]