isipin

Etymology
From.

Noun

 * 1) things that need careful or deep thinking; something to think about
 * 2) problem

Adjective

 * 1) needing careful or deep thinking

Verb

 * 1) to think about something
 * 2) to try to remember
 * 3) to study carefully before making a decision
 * 1) to try to remember
 * 2) to study carefully before making a decision
 * 1) to study carefully before making a decision