Given to emotion
sentimental, sensitive, warm, gushing, hysterical, demonstrative, fiery, zealous, fervent, ardent, soulful, enthusiastic, passionate, fanatic, excitable, impulsive, spontaneous, impetuous, nervous, high-strung, disturbed, agitated, excited, wrought-up, overwrought, worked up, temperamental, irrational, overemotional, histrionic, melodramatic, sentient, oversensitive, hypersensitive, maudlin, overflowing, affectionate, loving, warmhearted, tenderhearted, lachrymose, teary, sloppy*, gaga*, drooling*, icky*, wearing one's heart on one's sleeve*, mushy*, gooey*, soppy*; see also sentimental.
Antonyms rational, cold*, hard.