Synonym: innocuous, nonmalignant. Similar words: tactlessness, harm, charm, harmed, harmful, harmony, harmonize, harmonious. Meaning: ['hɑrmlɪs /hɑːm-] 
adj. 1. not causing or capable of causing harm 2. not injurious to physical or mental health 3. not producing any toxic effects 4. unlikely to harm or disturb anyone 5. not threatening to life or health; not malignant.
adj. 1. not causing or capable of causing harm 2. not injurious to physical or mental health 3. not producing any toxic effects 4. unlikely to harm or disturb anyone 5. not threatening to life or health; not malignant. 
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31. The other half will swallow harmless sugar pills.
32. This is a fairly modest and harmless little Bill.
33. What could be more peaceful, more harmless?
34. He seemed so ordinary, so harmless.
35. And he looks so damned harmless.
36. Britain's eccentricity is not entirely harmless.
37. All it is is a harmless holiday romance.
38. Maybe 90 percent of the species are relatively harmless.
39. It is quite harmless but doesn't look it.
40. All four devices, destroyed by controlled explosions, were harmless.
41. A little bunny seemed harmless enough.
42. The harmless noises of the countryside surrounded him.
43. Introduce intellectual reasoning,(sentencedict.com/harmless.html) and of course this threat is seen as harmless.
44. I don't know why you're so upset -- it was only a harmless bit of fun.
45. There are over 80 strains, the vast majority symptomless and harmless.
46. The first two are abundant in nature and are normally harmless.
47. Like the rainwater they'd drunk, little green guy meat seemed harmless.
48. Tea and marijuana are in themselves fairly harmless, yet tea is generally legal and marijuana not.
49. A harmless pleasure can become the gateway to nameless hells when for whatever reasons it begins to carry a significant symbolic meaning.
50. Wyatt liked the city manager, his tiredness and efficiency and harmless irascibility.
51. But some diseases remain fatal, while others quickly become almost harmless.
52. Even seemingly harmless facts may prove incriminating in light of other information Starr has unearthed.
53. We need to persuade parents that almost all vaccines are harmless.
54. The venom of most spiders, though effective against their insect prey(sentencedict.com), is harmless to man.
55. Some items are harmless in themselves, but cause enormous environmental damage to make. 3.
56. Sulphur hexafluoride itself is harmless except in a confined space, where it displaces oxygen and can asphyxiate people.
57. It has been forced to reveal itself due to strict new regulations for healthier office environments and appears quite harmless!
58. The tribes which inhabit the Upper Hunter and the adjacent parts of the colony are extremely harmless and well disposed.
59. Why should it suspect these harmless creatures of any evil intent?
60. Some urinary games are fairly harmless, but I reckon this one could damage your delicate vaginal tissue.
More similar words: tactlessness, harm, charm, harmed, harmful, harmony, harmonize, harmonious, disharmony, less, bless, unless, lesson, endless, careless, witless, harness, hopeless, tactless, nonetheless, reckless, flawless, much less, homeless, senseless, guileless, pointless, breathless, changeless, regardless.