1.
hard, painful, difficult to bear
Describing something emotionally or physically difficult to endure. Expresses suffering or hardship.
辛い conjugates as an i-adjective: 辛くない (negative), 辛くて (te-form), 辛かった (past).
Note: The kanji 辛い can also be read からい (meaning spicy). Context usually makes the meaning clear. 辛い (つらい) expresses emotional/physical hardship, while 辛い (からい) describes spicy taste.