Have a tendency to exaggerate / lose his/her temper / make snap (quick) decisions

A sly/crafting person is clever and good at deceiving people.

astuto

69. 
    cunning
    

showing inventiveness and skill

70. 
    crafty
    

marked by skill in deception

A sly/crafting person is clever and good at deceiving people.

71. 
    glum
    

moody and melancholic

72. 
    shy
    

timid and lacking self-confidence

73. 
    insecure
    

lacking in safety

74. 
    sensible
    

able to feel or perceive

75. 
    level-headed
    

exercising or showing good judgment

76. 
    biased
    

favoring one person or side over another

77. 
    evenhanded
    

without partiality

78. 
    grumpy
    

annoyed and irritable

79. 
    demanding
    

requiring more than usually expected or thought due

80. 
    touchy
    

difficult to handle; requiring great tact

81. 
    fussy
    

exacting especially about details

82. 
    courageous
    

able to face and deal with danger or fear without flinching

83. 
    quick-witted
    

able to think and respond rapidly and effectively

84. 
    on the go
    

(of a person) very busy and active

to be on the go

85. 
    nosy
    

offensively curious or inquisitive

86. 
    witty
    

demonstrating striking cleverness and humor

87. 
    cheeky
    

offensively bold

he is cheeky because he can be rude to people older than him

88. 
    sociable
    

inclined to or conducive to companionship with others

89. 
    outgoing
    

at ease in talking to others

90. 
    independent
    

free from external control and constraint

91. 
    free spirit
    

someone acting freely or even irresponsibly

adj. free-spirited

92. 
    antisocial
    

shunning contact with others

93. 
    extravagant
    

recklessly wasteful

94. 
    generous
    

willing to give and share unstintingly

95. 
    kind
    

having a tender and considerate and helpful nature

96. 
    sensitive
    

responsive to physical stimuli

97. 
    considerate
    

showing concern for the rights and feelings of others

98. 
    thoughtful
    

exhibiting or characterized by careful consideration

99. 
    thoughtless
    

without or lacking careful consideration of consequences

100. 
     inconsiderate
     

lacking regard for the rights or feelings of others

101. 
     selfish
     

concerned chiefly with your own advantage

102. 
     self-centred
     

limited to or caring only about yourself and your own needs

103. 
     ambitious
     

having a strong desire for success or achievement

104. 
     single-minded
     

determined

105. 
     brainiac
     

someone who has exceptional intellectual ability and originality

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