Antonym: perhaps. Similar words: certainly not, certain, uncertain, for certain, uncertainty, entertainment, mainly, ungainly. Meaning: ['sɜːtnlɪ] 
adv. definitely or positively (`sure' is sometimes used informally for `surely').
adv. definitely or positively (`sure' is sometimes used informally for `surely'). 
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61. This was certainly a welcome change of fortune.
62. The increased costs will certainly strain our finances.
63. Today's inflation figure is certainly too high.
64. She's certainly not great shakes as a mother.
65. She certainly lives life to the full.
66. He's certainly not afraid to speak his mind.
67. Smoking certainly contributed to his early death.
68. The picture certainly doesn't flatter her.
69. Depend on it, our team will certainly win.
70. The programme certainly provides plenty of food for thought.
71. Victory certainly belongs to the people.
72. These old boots have certainly seen some service.
73. Torture was certainly practised by Europeans upon Europeans.
74. I certainly haven't reached the summit of my career.
75. 'It's a lovely day.' 'It certainly is.'/'Yes it is.'
76. He certainly believed in preaching hellfire and damnation.
77. She certainly owes you an apology.
78. An early general election is certainly on the cards.
79. Her new job certainly keeps her on the trot.
80. I certainly treasure the friendship between us very much.
81. 'You certainly won't!' Katherine said positively.
82. He is certainly a good salesclerk.
83. The lack of money will certainly sink our plan.
84. The wine had certainly loosened her tongue.
85. Luck is certainly one deciding factor.
86. The tax increases will certainly hit the poor.
87. The town centre certainly needs a face-lift.
88. Things certainly seem to be going our way.
89. Will you help me please? Certainly!
90. It certainly doesn't rank as his greatest win.
More similar words: certainly not, certain, uncertain, for certain, uncertainty, entertainment, mainly, ungainly, curtain, maintain, concert, undertake, obtain, retain, sustain, captain, contain, container, retaining, sustainable, in line, only, openly, if only, only too, fall in love, in line with, commonly, only that, cancer.