思春期 （シシュンキ） puberty, adolescence

思考 （シコウ） thought, consideration, thinking

相思 （ソウシ） mutual affection, mutual love

哀思 （アイシ） sad feeling

思う （おもう） to think, to consider, to believe, to reckon, to think (of doing), to plan (to do), to judge, to assess, to regard, to imagine, to suppose, to dream, to expect, to look forward to, to feel, to be (in a state of mind), to desire, to want, to care (deeply) for, to yearn for, to worry about, to love, to recall, to remember

思う存分 （おもうぞんぶん） to one's heart's content, to one's complete satisfaction, as much as one likes, heartily, thoroughly, without restraint, to the full

思す （おぼす） to think, to consider, to think dearly of, to care for, to cherish