Antonym: unlawful. Similar words: unlawful, unlawfulness, awful, awfully, sorrowful, sorrowfully, law, claw. Meaning: ['lɔːfʊl] 
adj. 1. conformable to or allowed by law 2. according to custom or rule or natural law 3. having a legally established claim 4. authorized, sanctioned by, or in accordance with law.
adj. 1. conformable to or allowed by law 2. according to custom or rule or natural law 3. having a legally established claim 4. authorized, sanctioned by, or in accordance with law. 
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1. When an end is lawful and obligatory, the indispensable means to is are also lawful and obligatory. 
2. Judge Keenan concluded that the surveillance had been lawful.
3. He recognized John as his lawful heir.
4. Can an act that causes death ever be lawful?
5. It was lawful for the doctors to treat her in whatever way they considered was in her best interests.
6. This is a perfectly lawful activity.
7. It is not lawful to steal.
8. We don't recognized him to be the lawful heir.
9. We don't recognised him to be the lawful heir.
10. Politicians know they cannot create a lawful society simply at the stroke of a pen.
11. He said he was going about his lawful business as a journalist.
12. Marriage by a priest is lawful in England without another ceremony.
13. by lawful/legal means. Lawful tends to be used in technical or literary contexts. The same is true of the opposites, unlawful and illegal, but illegal is used especially about criminal activities. Legal also means 'connected with the law':the US legal system.
14. Everyone recognized him to be the lawful heir / as the lawful heir.
14. Sentencedict.com is a online sentence dictionary, on which you can find nice sentences for a large number of words.
15. It is not lawful to park in front of a hydrant.
16. It is not lawful to kill or injure a pet animal.
17. In my judgment it is lawful.
18. Rarely promise, but, if lawful, constantly perform. William Penn
19. The police may not interfere in lawful demonstrations.
20. Hunting is a lawful activity.
21. The FBI will use all reasonable and lawful means to gather intelligence information.
22. The correct lawful fare for the journey was in the region of 10s. 6d.
23. If he is a lawful visitor it is necessary to go to the 1957 Act.
24. A lawful visitor is a person who has the permission of the occupier to enter the premises.
25. Ignoring lawful procedures, Chun and his coconspirators took their dramatic actions before obtaining the approval of President Choi.
26. Everyone should learn how to defend himself by the lawful means.
27. We can not commit an act of war unless it is lawful.
28. This may sound like petty whimpering, but intrusions upon the exercise of lawful freedom is no small matter.
29. They can be changed only by agreement or by the adjudication of a lawful authority such as an international court.
30. But there is no identifiable general principle determining which acts of government require positive legal authorization in order to be lawful.